Stator, brushless motor, stator manufacturing method

ABSTRACT

A stator includes: plural core configuration sections each including plural yoke configuration sections that configure a ring shaped yoke and are segmented in a yoke circumferential direction and plural teeth sections that project from the respective yoke configuration sections along a yoke radial direction, with the plural yoke configuration sections and the plural teeth sections integrated together; plural coil wires that are wound onto the respective teeth sections to configure plural winding portions; and plural insulators that each include plural insulator portions that are integrated to each of the respective core configuration sections and insulate between the teeth sections and the winding portions, and a connection portion that connects together the plural insulator portions.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of, and claims priorityto, U.S. application Ser. No. 15/420,108, filed Jan. 31, 2017, which isa divisional application of, and claims priority to, U.S. applicationSer. No. 13/752,396, filed on Jan. 29, 2013, which is based on andclaims priority under 35 U.S.C. § 119 from Japanese Patent ApplicationNo. 2012-25297, filed on Feb. 8, 2012, Japanese Patent Application No.2012-25298, filed on Feb. 8, 2012, Japanese Patent Application No.2012-40627, filed on Feb. 27, 2012, Japanese Patent Application No.2012-95870, filed on Apr. 19, 2012, Japanese Patent Application No.2012-95871, filed on Apr. 19, 2012, Japanese Patent Application No.2012-95872, filed on Apr. 19, 2012, and Japanese Patent Application No.2012-252190, filed on Nov. 16, 2012. The entire contents of all of theapplications identified above are hereby incorporated by reference intothis application.

BACKGROUND OF THE INVENTION Technical Field

The present invention relates to a stator, a brushless motor, and astator manufacturing method.

Related Art

Known stators employed in a brushless motor are for example disclosed inJapanese Patent Application Laid-Open (JP-A) No. 9-322441. JP-A No.9-322441 discloses an armature with a yoke configured by plural ringshaped yoke configuration sections segmented along the axial direction.Each of the yoke configuration sections is integrally formed with pluraltooth portions that project towards a radial direction outside of theyoke.

As disclosed in Japanese Patent No. 3816783, known stators include astator core and a pair of insulators mounted to the stator core fromboth axial direction sides of the stator core.

SUMMARY

However, when the technology of JP-A No. 9-322441 is applied to anarmature employed in an inner rotor type rotating machine armature, theplural tooth portions project towards a radial direction inside of eachof the yoke configuration portions. It is accordingly difficult to winda coil from the radial direction outside of each of the yokeconfiguration portions with the flyer of a flyer machine. The coils needto be wound from the radial direction inside of each of the yokeconfiguration portions with a nozzle of a nozzle machine. However insuch cases, since it is necessary to secure space for passage of thenozzle, it is difficult to achieve a high dense arrangement of thecoils, this being disadvantageous in terms of reducing the size of arotating machine. Moreover, the coil winding speed when employing anozzle machine is lower than when employing a flyer machine. This isdisadvantageous to high-speed coil winding operations, and thereforealso disadvantageous to reducing costs resulting by reducing the numberof equipment units.

Note that a flyer machine is a device that moves the flyer to circle theperiphery of a tooth portion while aligning and winding a coil over thetooth portion with a variable former. A nozzle machine is a device thatwinds a coil on a tooth portion by repeatedly alternating between aprocess in which the nozzle circles the periphery of the tooth portionand a process of sliding the nozzle in the axial direction.

Since a stator disclosed in Japanese Patent No. 3816783 is provided witha pair of insulators, the number of components required to assemble thestator is increased.

In consideration of the above circumstances, the present invention isdirected towards achieving a more compact and lower cost stator to beemployed in a brushless motor.

The present invention is also directed towards providing a statormanufacturing method that can reduce the number of components necessaryto assemble the stator.

In order to address the above issues, a stator of a first aspect of thepresent invention includes: plural core configuration sections eachincluding plural yoke configuration sections that configure a ringshaped yoke and are segmented in a yoke circumferential direction andplural teeth sections that project from the respective yokeconfiguration sections along a yoke radial direction, with the pluralyoke configuration sections and the plural teeth sections integratedtogether; plural coil wires that are wound onto the respective teethsections to configure plural winding portions; and plural insulatorsthat each includes plural insulator portions that are integrated to eachof the respective core configuration sections and insulate between theteeth sections and the winding portions, and a connection portion thatconnects together the plural insulator portions.

Due to the configuration described above, the stator is for examplemanufactured using the following processes. First, the coreconfiguration sections are integrated to the insulator portions of eachof the insulators to form sub-assemblies of plural groups. Next, a flyermachine is employed to wind the coil wires onto the respective teethsections of each of the sub-assemblies from a radial direction outside,forming stator configuration sections for each of the groups. Then, theplural stator configuration sections are assembled together to form thestator. The stator is manufactured by these processes.

In the stator, the yoke is segmented in the yoke circumferentialdirection and configured from the plural yoke configuration sections.Therefore, even when the stator is employed in a brushless motor inwhich plural teeth sections project along the yoke radial direction, thesub-assemblies for each of the plural groups are formed as describedabove, and the coil wires can be wound using a flyer machine onto eachof the teeth sections of each of the sub-assemblies from the radialdirection outside. There is accordingly no need to secure space betweenthe teeth sections, as is required when a nozzle machine is employed,enabling a higher dense arrangement of the coil wires to be achieved,and enabling a more compact stator to be realized.

Moreover, as described above, the yoke is segmented in the yokecircumferential direction into the plural yoke configuration sections,and so, for example, the stator can be made more compact in the yokeaxial direction than in cases in which the yoke is segmented into pluralyoke configuration sections in the yoke axial direction.

When a flyer machine is employed, since the winding speed of the coilwires is higher than when using a nozzle machine, the process of windingthe coil wires can be speeded up, and accordingly a reduction in cost ofthe stator can be achieved due to reducing the number of equipmentunits.

As in a stator of a second aspect of the present invention, the statorof the first aspect is preferably configured wherein the plural coilwires configure plural phases.

A stator of a third aspect of the present invention is the stator of thefirst aspect or the second aspect wherein: each of the coil wiresincludes plural crossing wires that connect together the plural windingportions and are laid out at the connection portion; the pluralconnection portions are disposed with a gap between each other in onedirection out of the yoke radial direction, the yoke axial direction, orin a direction that is a combination thereof; and a housing portion isformed to at least one connection portion out of the plural connectionportions for housing a member.

According to this stator, the housing portion for housing a member isformed to at least one connection portion out of the plural connectionportions that are disposed with a gap between each other in onedirection out of the yoke radial direction, the yoke axial direction, orin a direction that is a combination thereof. Interference between theconnection portion and the member can accordingly be avoided, enablingthe stator to be realized with an even more compact size and lower cost.

A stator of a fourth aspect of the present invention is the stator ofany one of the first aspect to the third aspect wherein: each of thecoil wires includes plural crossing wires that connect together theplural winding portions and are laid out at at least one of the pluralconnection portions; and each of the connection portions includes aretaining portion that retains the plural crossing wires laid out at theconnection portion.

According to this stator, each of the connection portions includes theretaining portion that retains the plural crossing wires that are laidout at the connection portion. Therefore, for example, the crossingwires can be retained at the connection portions by the retainingportions when forming the stator by assembling together the pluralstator configuration sections as described above, and so efficienthandling can be achieved when assembling together the plural statorconfiguration sections. Moreover, even after the stator has beenincorporated in a brushless motor, the crossing wires are retained atthe connection portions by the retaining portions, and therefore,flapping of the crossing wires can be suppressed, enabling noise andfault occurrence to be suppressed.

A stator of a fifth aspect of the present invention is the stator of anyone of the first to the fourth aspects wherein: the plural connectionportions are disposed with a gap between each other in the yoke radialdirection; and at least one of the plural connection portions includes aspacer provided between the plural connection portions in the yokeradial direction and retaining the plural connection portions in a stateseparated from each other in the yoke radial direction.

According to this stator, the plural connection portions can be retainedin a state separated from each other in the yoke radial direction by thespacer. Space for laying out the crossing wires between the pluralconnection portions in the yoke radial direction can accordingly besecured, and rattling of the plural connection portions can also besuppressed.

A stator of a sixth aspect of the present invention is the stator of anyone of the first to the fourth aspects wherein: the plural connectionportions are disposed with a gap between each other in the yoke axialdirection; at least one of the plural connection portions includes aspacer provided between the plural connection portions in the yoke axialdirection and retaining the plural connection portions in a stateseparated from each other in the yoke axial direction.

According to this stator, the plural connection portions can be retainedin a state separated from each other in the yoke axial direction by thespacer. Space for laying out the crossing wires between the pluralconnection portions in the yoke axial direction can accordingly besecured, and rattling of the plural connection portions can also besuppressed.

A stator of a seventh aspect of the present invention is the stator ofany one of the first to the sixth aspects wherein the plural connectionportions are provided coaxially to the yoke.

According to this stator, the connection portions are provided coaxiallyto the yoke, enabling the structure to be simplified.

A stator of an eighth aspect of the present invention is the stator ofthe third aspect wherein the member is a crossing wire out of the pluralcrossing wires, the crossing wire is laid out at the differentconnection portion form the connection portion having the housingportion.

According to this stator, interference between the connection portionsand the crossing wires can thereby be avoided, and so the length of thecrossing wires can be suppressed from increasing. The stator canaccordingly be made even more compact and at even lower cost.

A stator of a ninth aspect of the present invention is the stator of thefourth aspect wherein the retaining portion is formed in a projectionshape.

According to this stator, the retaining portion is formed in aprojection shape, enabling the structure to be simplified. Betterhandling can also be achieved when assembling the plural connectionportions together than in cases in which the plural connection portionsare fitted together around the entire circumference.

A stator of a tenth aspect of the present invention is the stator of thefifth aspect or the sixth aspect wherein the spacer is formed in aprojection shape.

According to this stator, the spacer is formed in a projection shape,enabling the structure to be simplified. Better handling can also beachieved when assembling the plural connection portions together than incases in which the plural connection portions are fitted together aroundthe entire circumference.

A stator of an eleventh aspect of the present invention is the stator ofany one of the first to the tenth aspects wherein the connection portionis positioned further to the yoke radial direction inside than the coreconfiguration section.

According to this stator, the connection portion is positioned furtherto the yoke radial direction inside than the core configuration section.Interference between the flyer of a flyer machine and the connectionportion can accordingly be suppressed when winding the coil wire on theteeth sections from the radial direction outside using the flyermachine.

A stator of a twelfth aspect of the present invention is the stator ofany one of the first to the eleventh aspects wherein: the insulatorportions of at least one of the plural insulators include insulator mainbody portions that are integrated to the respective core configurationsections and insulate between the teeth sections and the windingportions, and extending portions that are positioned further to theradial direction inside than the core configuration section and extendfrom the insulator main body portion in one direction out of the yokeaxial direction, the yoke radial direction, or the yoke circumferentialdirection, or a direction that is a combination thereof; and theconnection portion connects together the extending portions of theplural insulator portions.

According to this stator, the extending portions extend from theinsulator main body portions that are integrated to the respective coreconfiguration sections in one direction out of the yoke axial direction,the yoke radial direction, or the yoke circumferential direction, or adirection that is a combination thereof, and the extension end portionsof the extending portions are connected together by the connectionportion. The extending portion is positioned here further to the yokeradial direction inside than the core configuration section.Interference between the flyer of a flyer machine and the extendingportion and/or the connection portion can accordingly be suppressed whenwinding the coil wire on the teeth sections from the radial directionoutside using the flyer machine.

A stator of a thirteenth aspect of the present invention is the statorof any one of the first to the twelfth aspects wherein: the insulatorportion includes a first insulator portion and a second insulatorportion, the first insulator portion and the second insulator portioneach including a teeth section insulator portion and a yokeconfiguration section insulator portion respectively covering the teethsection and the yoke configuration section.

A stator of a fourteenth aspect of the present invention is the statorof any one of the first to the thirteenth aspects further including aterminal station that is provided to each of the plural insulators andthat connects to a terminal portion of each of the plural coil wires.

The terminal station is provided to each of the plural insulators, andeach of the terminal portions of the plural coil wires is connected tothe respective terminal station. Positioning of the terminal portions ofthe coil wires can accordingly be performed easily.

A stator of a fifteenth aspect of the present invention is the stator ofthe fourteenth aspect wherein: the connection portion is positioned atthe yoke radial direction inside; and a projection portion is formed toan end portion of at least one insulator portion out of the pluralinsulator portions at an opposite side to a yoke side, the projectionportion projecting out to the yoke side with respect to the connectionportion; and the terminal station is provided at the projection portion.

According to this stator, the terminal station is provided at theprojection portion that projects out to the yoke side with respect tothe connection portion. Interference between the terminal station andthe connection portion can accordingly be suppressed, and positioning ofthe terminal portions can accordingly be performed easily.

A stator of a sixteenth aspect of the present invention is the stator ofthe fifteenth aspect wherein: an insertion groove is formed to theprojection portion so as to open towards the yoke axial direction; andthe terminal station is inserted into the insertion groove.

According to this stator, the terminal station can be easily fixed tothe projection portion by inserting the terminal station into theinsertion groove formed to the projection portion.

A stator of a seventeenth aspect of the present invention is the statorof the fifteenth aspect or the sixteenth aspect wherein: the connectionportion is disposed displaced in the yoke axial direction with respectto the plural insulator portions; and the terminal station makes contactwith a surface on the yoke side of the connection portion.

According to this stator, the terminal station makes contact with asurface on the yoke side of the connection portion, and rattling of theterminal station can accordingly be suppressed.

A stator of an eighteenth aspect of the present invention is the statorof any one of the fourteenth to the seventeenth aspects wherein: each ofthe plural coil wires includes a crossing wire that connects togetherthe plural winding portions and that is laid out displaced in the yokeaxial direction with respect to the insulator portion; and the terminalstation is provided on the yoke axial direction opposite side to thecrossing wires.

According to this stator, the terminal station is provided on the yokeaxial direction opposite side to the crossing wires, enabling theterminal station and a control circuit to be connected together easilyat the opposite side to the crossing wires.

A stator of a nineteenth aspect of the present invention is the statorthe fourteenth aspect further including a guide portion that is formedalong the yoke axial direction at each of the plural insulators, whereinthe terminal portion of each of the plural coil wires is guided by theguide portion. Positioning of the terminal portions of the coil wirescan accordingly be performed easily.

A stator of a twentieth aspect of the present invention is the stator ofthe nineteenth aspect wherein the guide portion is provided to a sideface of the projection portion.

According to this stator, the guide portion is provided at theprojection portion projecting towards the yoke side with respect to theconnection portion, thereby enabling interference between the terminalportions and the connection portion to be suppressed, and enabling theterminal portions to be positioned easily.

A stator of a twenty-first aspect of the present invention is the statorof the fourteenth aspect wherein: one of the plural yoke configurationsections is provided with a terminal station that connects to a terminalportion of each of the plural coil wires.

The terminal station is provided to one of the plural yoke configurationsections and the terminal portions of each of the plural coil wires areconnected to the terminal station. Positioning of the terminal portionsof the coil wires can accordingly be performed easily.

A stator of a twenty-second aspect of the present invention is thestator of any one of the first to the twenty-first aspects furtherincluding a second connection portion that is separated in a stator coreaxial direction from the connection portion, that is formed to at leastone insulator out of the plural insulators, and that connects togetherthe plural insulator portions of the at least one insulator.

According to this stator, the second connection portion is formed to atleast one insulator out of the plural insulators, and connects togetherthe plural insulator portions of the at least one insulator. The secondconnection portion accordingly enables the rigidity between the pluralinsulator portions, and therefore the rigidity of the stator overallafter assembly, to be secured.

The second connection portion is separated in the stator core axialdirection from the connection portion. The rigidity of the overallstator after assembly can accordingly be secured with good balance.

A stator of a twenty-third aspect of the present invention is the statorof the twenty-second aspect wherein: the connection portion is disposedat a first side in the stator core axial direction; and the secondconnection portion is formed at the insulator positioned furthest to asecond side in the stator core axial direction out of the pluralinsulators when the plural insulators are in a pre-assembly statearranged along the stator core axial direction.

According to this stator, the second connection portion is formed to theinsulator positioned furthest to the stator core axial direction secondside out of the plural insulators when the plural insulators are in apre-assembly state arranged along the stator core axial direction.Accordingly interference of the insulator portions formed to the otherinsulators with the second connection portion can be avoided when theplural insulators are being assembled along the stator core axialdirection.

A stator of a twenty-fourth aspect of the present invention is thestator of the twenty-second aspect wherein: the plural connectionportions are disposed coaxially to each other and have differentexternal diameters to each other; and the second connection portion isformed to the insulator with the connection portion of the smallestexternal diameter out of the plural insulators.

According to this stator, the second connection portion is formed to theinsulator with the connection portion of the smallest external diameterout of the plural insulators. Accordingly interference of the insulatorportions formed to the other insulators with the second connectionportion can be avoided when the other insulators are being assembledfrom a first stator core axial direction side to the insulator with thefirst connection portion of the smallest external diameter.

A stator of a twenty-fifth aspect of the present invention is the statorof any one of the twenty-second to the twenty-fourth aspects wherein:the second connection portion connects together the plural extendingportions of one of the insulators.

According to this stator, the second connection portion connectstogether the plural extending portions of one of the insulators. Therigidity between the plural insulator portions can accordingly securedeven when each of the insulator portions includes the extending portionsextending from the first connection portion.

A stator of a twenty-sixth aspect of the present invention is the statorof any one of the twenty-second to the twenty-fifth aspects wherein theplural insulators have an interlocking structure for positioning withrespect to each other, the interlocking structure including: a fittingportion formed at the second connection portion; and a fitted-to portionthat fits together with the fitting portion and is formed to aninsulator portion positioned between a pair of insulator portionsconnected by the second connection portion out of the plural insulatorportions.

According to this stator, the fitting portion is formed to the secondconnection portion, and the fitted-to portion is formed to the insulatorportion positioned between a pair of insulator portions connected by thesecond connection portion out of the plural insulator portions. Fittingtogether of the fitting portion and the fitted-to portion canaccordingly be performed easily.

A stator of a twenty-seventh aspect of the present invention is thestator of any one of the twenty-second to the twenty-sixth aspectswherein: the insulator portion includes a first insulator portion and asecond insulator portion segmented in the stator core axial direction;the connection portion connects together the plural first insulatorportions of each of the insulators; and the second connection portionconnects together the plural first insulator portions in one of theinsulators.

According to this stator, the plural first insulator portions areconnected together by the second connection portion as well as theconnection portion in at least one of the plural insulators. Therigidity between the plural first insulator portions, and hence therigidity of the overall stator after assembly, can accordingly besecured by the second connection portion.

A stator of a twenty-eighth aspect of the present invention is thestator of any one of the twenty-second to the twenty-sixth aspectswherein: the insulator portion includes a first insulator portion and asecond insulator portion segmented in the stator core axial direction;the connection portion connects together the plural first insulatorportions of each of the insulators; and the second connection portionconnects together the plural second insulator portions in one of theinsulators.

According to this stator, the plural first insulator portions areconnected by the connection portion and the plural second insulatorportions are connected by the second connection portion in at least oneof the plural insulators. The rigidity between the plural firstinsulator portions and the rigidity between the plural second insulatorportions can accordingly be increased with good balance, and hence therigidity of the overall stator after assembly can be secured by theconnection portion and the second connection portion.

A stator of a twenty-ninth aspect of the present invention is the statorof any one of the first to the twenty-first aspect wherein: the pluralinsulators have an interlocking structure for positioning with respectto each other; the core configuration portion includes a teeth sectionextending along the stator core radial direction and a yokeconfiguration section formed to a leading end portion of the teethsection; the insulator portions each includes a yoke configurationsection insulator portion that covers the yoke configuration section;and the interlocking structure includes a fitting portion formed to afirst of adjacent of the yoke configuration section insulator portions,and a fitted-to portion that fits together with the fitting portion andis formed to a second of the adjacent yoke configuration sectioninsulator portions.

According to this stator, the fitting portion is formed at the first ofthe adjacent yoke configuration section insulator portions, and thefitted-to portion is formed to the second of the adjacent yokeconfiguration section insulator portion. Fitting together of the fittingportions and the fitted-to portions can accordingly be performed easily.

A stator of a thirtieth aspect of the present invention is the stator ofany one of the first to the twenty-first aspects further including aninterlocking structure that fixes the plural connection portionstogether.

This stator includes the interlocking structure that fixes the pluralconnection portions together. The rigidity between the plural connectionportions, and hence the rigidity of the overall stator after assembly,can accordingly be secured by fixing together the plural connectionportions with the interlocking structure.

A stator of a thirty-first aspect of the present invention is the statorof any one of the first to the thirtieth aspect wherein: pluralindependently formed groups of stator configuration sections areconfigured by assembling the plural core configuration sections to therespective plural insulators; in each of the plural stator configurationsection groups, the plural core configuration sections are disposed soas to form a gap corresponding to at least one core configurationsection between adjacent core configuration sections; the plural statorconfiguration section groups are disposed such that in a mutuallyassembled state a core configuration section of another group isdisposed in the gap; and each of the plural coil wires is formedcontinuously from end-to-end and includes a crossing wire that connectstogether the plural winding portions.

This stator in the configuration described above is for examplemanufactured using the following processes. Namely, first the coreconfiguration sections are integrated to the insulator portions of eachof the insulators, forming a sub-assembly for each of the plural groups.Next, the coil wire is wound on each of the teeth sections of each ofthe sub-assemblies from the radial direction outside using a flyermachine, forming a stator configuration section for each of the pluralgroups. Then, the plural stator configuration sections are assembledtogether to form the stator. The stator is manufactured by the aboveprocesses.

In each of the plural stator configuration section groups, the pluralcore configuration sections are disposed such that a gap correspondingto at least one core configuration section is present between adjacentcore configuration sections. Accordingly, as described above, the flyermachine can be suppressed from interfering with the other coreconfiguration sections when winding the coil wire on each of the teethsections of each of the sub-assemblies from the radial direction outsideusing a flyer machine.

Moreover, each of the plural coil wires is formed continuously fromend-to-end and includes the crossing wire that connects together theplural winding portions laid out along the connection portion.Slackening of the winding portion from the teeth section can accordinglybe suppressed.

A stator of a thirty-second aspect of the present invention is thestator of the thirty-first aspect wherein: out of the crossing wires, atleast one of the crossing wires connected to a winding start end portionof the winding portion and one of the crossing wires connected to awinding finish end portion of the winding portion cross over at aconnection vicinity between the connection portion and the insulatorportion.

According to this stator, at least one of the crossing wires connectedto the winding start end portion of the winding portion and one of thecrossing wires connected to the winding finish end portion of thewinding portion cross over at the connection vicinity between theconnection portion and the insulator portion. Accordingly, slackening ofthe winding portion from the teeth section can be even more effectivelysuppressed.

A stator of a thirty-third aspect of the present invention is the statorof the thirty-second aspect wherein: each of the insulator portionsincludes an insulator main body portion that is integrated to the coreconfiguration section and insulates between the teeth section and thewinding portion, and an extending portion that connects together theinsulator main body portion and the connection portion; and a radialdirection extension portion is formed to the extending portion so as toextend in a radial direction of the stator configuration section fromthe connection portion; and an intersection portion between the crossingwire connected to the winding start end portion of the winding portionand the crossing wire connected to the winding finish end portion of thewinding portion is disposed at a position that overlaps with the radialdirection extension portion as viewed along the stator configurationsection axial direction.

According to this stator, the radial direction extending portion thatextends in the radial direction of the stator configuration section isformed to the extending portion that connects together the insulatormain body portion and the connection portion, and the intersectionportion mentioned above is disposed at the position that overlaps withthe radial direction extension portion as viewed along the statorconfiguration section axial direction. Slackening of the winding portionfrom the teeth section can accordingly be even better suppressed due tothe crossing wires mentioned above intersecting in a space secured bythe radial direction extension portion.

A stator of a thirty-fourth aspect of the present invention is thestator of the thirty-second aspect wherein: each of the insulatorportions includes an insulator main body portion that is integrated tothe core configuration section and insulates between the teeth sectionand the winding portion, and an extending portion that connects togetherthe insulator main body portion and the connection portion; and an axialdirection extension portion is formed to the extending portion so as toextend in an axial direction of the stator configuration section fromthe connection portion; and an intersection portion between the crossingwire connected to the winding start end portion of the winding portionand the crossing wire connected to the winding finish end portion of thewinding portion is disposed at a position that overlaps with the axialdirection extension portion as viewed along the stator configurationsection radial direction.

According to this stator, the axial direction extending portion thatextends in the stator configuration section axial direction is formed tothe extending portion that connects together the insulator main bodyportion and the connection portion, and the intersection portionmentioned above is disposed at the position that overlaps with the axialdirection extension portion as viewed along the stator configurationsection radial direction. Slackening of the winding portion from theteeth section can accordingly be even better suppressed due to thecrossing wires mentioned above intersecting in a space secured by theaxial direction extension portion.

A stator of a thirty-fifth aspect of the present invention is the statorof any one of the first to the thirty-fourth aspects wherein the teethsection projects from the yoke configuration section towards the yokeradial direction inside.

Accordingly, even when the teeth section projects from the yokeconfiguration section towards the yoke radial direction inside, the coilwire can be wound on each of the teeth sections of each of thesub-assemblies from the radial direction outside using a coil wirewinding machine due to the yoke being configured by the plural yokeconfiguration sections segmented in the yoke circumferential direction.

A stator of a thirty-sixth aspect of the present invention is the statorof any one of the first to the thirty-fifth aspects wherein: theinsulator portion includes an extension side wall portion that extendsalong an axial direction of the stator configuration section; and ineach of the plural stator configuration section groups, with respect toan imaginary line extending in a tangential direction to the statorconfiguration section so as to pass through the extension side wallportion, an end in the circumferential direction of the yokeconfiguration section of a first core configuration section ispositioned so as to be on the opposite side to a second coreconfiguration section disposed adjacent to the first core configurationsection with the imaginary line being disposed between the first andsecond core configuration sections.

According to this stator, in each of the plural stator configurationsection groups, with respect to the imaginary line extending in atangential direction to the stator configuration section so as to passthrough the extension side wall portion, the end in the circumferentialdirection of the yoke configuration section of the first coreconfiguration section is positioned so as to be on the opposite side tothe second core configuration section adjacent to the first coreconfiguration section with the imaginary line being disposed between thefirst and the second core configuration sections. Accordingly, asdescribed above, even when a coil wire winding machine is employed towind the coil wire on each of the teeth sections of each of thesub-assemblies from the radial direction outside, the coil wire windingmachine can be suppressed from interfering with other core configurationsections, and in particular, with the yoke configuration sectioncircumferential direction ends thereof.

A stator of a thirty-seventh aspect of the present invention is thestator of any one of the first to the thirty-fourth aspects, wherein theplural teeth sections project from the yoke configuration sectiontowards the yoke radial direction outside.

Accordingly, since the interval between leading end portions of theadjacent e teeth sections can be secured when the teeth sections projectfrom the yoke configuration section towards the yoke radial directionoutside, a coil wire winding machine can be employed to wind the coilwire on each of the teeth sections from the radial direction outside.

A stator of a thirty-eighth aspect of the present invention is thestator of the thirty-seventh aspect, wherein adjacent yoke configurationsections are fitted together with recess and protrusion shaped fittingportions.

The rigidity of the yoke can accordingly be raised when the adjacentyoke configuration sections are fitted together with recess andprotrusion shaped fitting portions.

A stator of a thirty-ninth aspect of the present invention is the statorof any one of the thirty-fifth to the thirty-eighth aspects, wherein thewinding portions are compression deformed by pressing.

According to this stator, the winding portions are compression deformedby pressing. Bulging of the winding portions can accordingly besuppressed, and high dense arrangement of the coil wires can beachieved, and space for pressing operation by a press can be secured.

A stator of a fortieth aspect of the present invention is the stator ofany one of the thirty-fifth to the thirty-ninth aspects wherein: each ofthe plural stator configuration section groups is configured by acombination of mutually different phases; in each of the statorconfiguration sections the plural teeth sections are disposed at evenintervals from each other; and out of the plural winding portions, apair of winding portions that face each other across a statorconfiguration section axis are formed from the same coil wire and areformed by winding in reverse directions to each other.

According to this stator, in each of the stator configuration sections,the plural teeth sections are disposed at even intervals from eachother, so the intervals between the plural teeth sections can berespectively secured. The coil wire can accordingly be easily wound onthe teeth sections.

A stator of a forty-first aspect of the present invention is the statorof the fortieth aspect wherein: a winding portion wound in a looseningdirection on the teeth section out of the pair of winding portions and acrossing wire between the pair of winding portions are connectedtogether by a lead portion that is led out from the teeth section; aprotrusion portion to which the lead portion is anchored is formed tothe insulator; and the winding portion wound in a loosening direction onthe teeth section out of the pair of winding portions is restricted fromslackening by the lead portion being anchored to the protrusion portion.

According to this stator, the winding portion wound in the looseningdirection on the teeth section is restricted from slackening by the leadportion anchoring to the protrusion portion. Accordingly, slackening ofthe winding portion wound on the teeth section in the looseningdirection can be suppressed.

A brushless motor of a forty-second aspect of the present inventionincludes the stator according to any one of the first to the forty-firstaspects and a rotor that rotates in a rotational magnetic fieldgenerated by the stator.

According to this brushless motor, a compact size and low cost can berealized by employing the stator of any one of the first to theforty-first aspects

A forty-third aspect of the present invention is a manufacturing methodof the stator of any one of the first to the fortieth aspects including:a sub-assembly forming process in which the core configuration sectionsare integrated to the insulator portions of each of the insulators toform a sub-assembly for each of plural groups; a stator configurationsection forming process in which the stator configuration sections areformed for each of the plural groups by winding the coil wire on each ofthe teeth sections of each of the sub-assemblies from a radial directionoutside of the stator configuration section using a coil wire windingmachine; and a stator forming process that forms a stator by assemblingthe plural stator configuration sections together.

According to this stator manufacturing method, the sub-assemblies areformed for each of the plural groups, and the coil wire is wound on eachof the teeth sections of each of the sub-assemblies from the radialdirection outside of the stator configuration section using the coilwire winding machine. There is accordingly no need to secure spacebetween the teeth sections, as would be required when employing a nozzlemachine. High dense arrangement of the coil wire is accordinglypossible, and a compact size can be achieved for the stator.

Moreover, the sub-assemblies are formed for each of the plural groups,and the coil wire is wound on each of the teeth sections of each of thesub-assemblies from a radial direction outside. An increased speed inthe coil wire winding process is accordingly realized, and therefore areduction in cost of the stator can be realized due to a reduction inthe number of equipment units.

A stator manufacturing method of a forty-fourth aspect of the presentinvention is the stator manufacturing method of the forty-third aspectfurther including: between the stator configuration section formingprocess and the stator forming process, a compression process thatpresses and compression deforms the winding portions in each of theplural stator configuration section groups.

According to this stator manufacturing method, the winding portions arepressed and compression deformed in the compression process. Bulging ofthe winding portions can accordingly be suppressed, and high densearrangement of the coil wires can be achieved, and space for thepressing operation by a press can be secured.

A stator manufacturing method of a forty-fifth aspect of the presentinvention is the stator manufacturing method of the forty-fourth aspect,wherein in the compression process the winding portions are pressed froma direction orthogonal to a teeth section axial direction.

According to this stator manufacturing method, in the compressionprocess the winding portions are pressed from a direction orthogonal tothe teeth section axial direction. Bulging of the winding portions canaccordingly be further suppressed, and high dense arrangement of thecoil wires can be achieved.

A stator manufacturing method of a forty-sixth aspect of the presentinvention is the stator manufacturing method of the forty-fourth aspector the forty-fifth aspect, wherein in the compression process thewinding portions are pressed from both sides of the direction orthogonalto the teeth section axial direction.

According to this stator manufacturing method, in the compressionprocess, the winding portions are pressed from both sides of thedirection orthogonal to the teeth section axial direction. The windingportions can accordingly be further compression deformed.

A stator manufacturing method of a forty-seventh aspect of the presentinvention is the stator manufacturing method of the forty-fourth aspect,wherein in the compression process the winding portions are pressed suchthat the pressing direction on the winding portions is a tangentialdirection to the respective stator configuration sections.

According to this stator manufacturing method, in the compressionprocess the winding portions are pressed such that the pressingdirection on the winding portions is a tangential direction to therespective stator configuration sections. In each of the plural statorconfiguration section groups here, the plural core configurationsections are disposed such that at least a gap corresponding to onestator configuration section is present between adjacent of the pluralcore configuration sections. The winding portions can accordingly bepressed whilst still suppressing interference between the press and thecore configuration sections.

A stator manufacturing method of a forty-eighth aspect of the presentinvention includes: an installation and cutoff process that employs aninsulator in which plural first insulator portions, second insulatorportions, and bridging sections have been integrated together and eachof the bridging sections connect together the first insulator portionsand the second insulator portions, that installs a core configurationsection for forming a stator core to one portion out of the firstinsulator portion and the second insulator portion, and that cuts offthe bridging section; a positional alignment process that performspositional alignment between the other portion out of the firstinsulator portion and the second insulator portion and the coreconfiguration section by moving at least one portion out of the firstinsulator portion and the second insulator portion with respect to theother portion; an installation process that installs the other portionout of the first insulator portion and the second insulator portion tothe core configuration section; and a coil wire winding process thatforms a coil wire winding portion with a coil wire on the coreconfiguration section by winding the coil wire on the core configurationsection with the first insulator portion and the second insulatorportion interposed therebetween.

According to this stator manufacturing method, an insulator is employedin which the plural first insulator portions, second insulator portions,and bridging sections have been integrated together and the bridgingsections connect together the first insulator portions and the secondinsulator portions. A reduction in the number of components required forstator assembly can hence be achieved in comparison to cases in which aninsulator is employed wherein the first insulator portions and thesecond insulator portions are formed separately.

A stator manufacturing method of a forty-ninth aspect of the presentinvention is the stator manufacturing method of the forty-eighth aspect,wherein in the installation and cutoff process, the bridging section iscut off after the core configuration section has been installed to theone portion out of the first insulator portion and the second insulatorportion.

According to this stator manufacturing method, in the installation andcutoff process, the bridging section is cut off after the coreconfiguration section has been installed to the one portion out of thefirst insulator portion and the second insulator portion. Accordingly,for example when installing the core configuration section to the oneportion out of the first insulator portion and the second insulatorportion, the entire insulator including the first insulator portion andthe second insulator portion can be set in a jig in one operation whenthe insulator is set in a jig. A reduction in the number of processesfor setting the insulator in the jig can accordingly be achieved incomparison to cases in which the bridging portion is cut off before thecore configuration section has been installed to the one portion out ofthe first insulator portion and the second insulator portion.

A stator manufacturing method of a fiftieth aspect of the presentinvention is the stator manufacturing method of the forty-eighth aspector the forty-ninth aspect wherein, as the insulator, the first insulatorportion and the second insulator portion each respectively include ateeth section insulator portion and a yoke configuration sectioninsulator portion that respectively cover a teeth section and a yokeconfiguration section formed to the core configuration section, and thebridging section connects together the yoke configuration sectioninsulator portions of the first insulator portion and the secondinsulator portion.

The teeth section of the core configuration section is a location atwhich the coil wire is wound to form a coil wire winding portion.Moreover, for example a guide portion that guides the terminal portionof the coil wire is formed at a base end side of the teeth section ofthe core configuration section.

With regards to this point, according to this stator manufacturingmethod, the bridging section is employed in the insulator to connecttogether the yoke configuration section insulator portions of the firstinsulator portions and the second insulator portions. Accordingly, it ispossible to suppress the bridging section provided to cause adverseinfluence to for example the coil wire winding portion and the guideportion.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the present invention will be described in detail basedon the following figures, wherein:

FIG. 1 is a perspective view illustrating a stator according to a firstexemplary embodiment of the present invention;

FIG. 2A is a perspective view illustrating a U-phase statorconfiguration section illustrated in FIG. 1;

FIG. 2B is a perspective view illustrating a V-phase statorconfiguration section illustrated in FIG. 1;

FIG. 2C is a perspective view illustrating a W-phase statorconfiguration section illustrated in FIG. 1;

FIG. 3A is a perspective view illustrating a process in which the pluralstator configuration sections illustrated in FIG. 1 are being assembledtogether;

FIG. 3B is a perspective view illustrating a state in which assembly hasprogressed further than in FIG. 3A;

FIG. 4 is a cross-section illustrating a schematic configuration of abrushless motor provided with the stator illustrated in FIG. 1;

FIG. 5 is a drawing to explain winding of a coil wire by a flyermachine;

FIG. 6 is a drawing to explain plural connection patterns of coil wiresapplicable to a stator according to the first exemplary embodiment ofthe present invention;

FIG. 7 is a perspective view illustrating a stator according to a secondexemplary embodiment of the present invention;

FIG. 8 is a perspective view illustrating a U-phase stator configurationsection illustrated in FIG. 7;

FIG. 9 is a perspective view illustrating an assembled state of acontrol circuit section to the stator illustrated in FIG. 7;

FIG. 10 is a perspective view illustrating a first modified example ofthe stator illustrated in FIG. 7;

FIG. 11 is an enlarged perspective view illustrating relevant portionsof a second modified example of the stator illustrated in FIG. 7;

FIG. 12 is an enlarged perspective view illustrating relevant portionsof a third modified example of the stator illustrated in FIG. 7;

FIG. 13 is an enlarged perspective view illustrating relevant portionsof a fourth modified example of the stator illustrated in FIG. 7;

FIG. 14 is a perspective view illustrating a fifth modified example ofthe stator illustrated in FIG. 7;

FIG. 15 is a drawing illustrating a first modified example of a statoraccording to the first exemplary embodiment;

FIG. 16 is a drawing illustrating a second modified example of a statoraccording to the first exemplary embodiment;

FIG. 17 is a drawing illustrating a third modified example of a statoraccording to the first exemplary embodiment;

FIG. 18A is a plan view illustrating a first group of the statorconfiguration sections illustrated in FIG. 17;

FIG. 18B is a plan view illustrating a second group of the statorconfiguration sections illustrated in FIG. 17;

FIG. 18C is a plan view illustrating a third group of the statorconfiguration sections illustrated in FIG. 17;

FIG. 19 is a side-on cross-section of a motor pump applied with abrushless motor according to the second exemplary embodiment of thepresent invention;

FIG. 20A is a side-on cross-section of plural connection portionsillustrated in FIG. 1;

FIG. 20B is a side-on cross-section of a first modified example ofplural connection portions illustrated in FIG. 20A;

FIG. 20C is a side-on cross-section of a second modified example ofplural connection portions illustrated in FIG. 20A;

FIG. 21 is a perspective view illustrating a stator according to a thirdexemplary embodiment of the present invention;

FIG. 22A is an exploded perspective view illustrating a U-phase statorconfiguration section illustrated in FIG. 21;

FIG. 22B is an exploded perspective view illustrating a V-phase statorconfiguration section illustrated in FIG. 21;

FIG. 22C is an exploded perspective view illustrating a W-phase statorconfiguration section illustrated in FIG. 21;

FIG. 23A is a plan view illustrating the insulator illustrated in FIG.22A;

FIG. 23B is a plan view illustrating the insulator illustrated in FIG.22B;

FIG. 23C is a plan view illustrating the insulator illustrated in FIG.22C;

FIG. 24A is a drawing illustrating the insulator illustrated in FIG. 22Aset in a jig and plural core configuration sections in a mounted stateto second insulator portions;

FIG. 24B is a drawing illustrating cut off of bridging section in theinsulators illustrated in FIG. 24A;

FIG. 24C is a drawing illustrating the insulators illustrated in FIG.24B with portions other than the second insulator portions having beenraised, and the second insulator portions having been slid;

FIG. 24D is a drawing illustrating the insulators illustrated in FIG.24C in a state with portions other than the second insulation sectionshaving been lowered, and first insulator portions in a mounted state tocore configuration sections;

FIG. 24E is a drawing illustrating coil wires being wound onto the coreconfiguration sections illustrated in FIG. 24D;

FIG. 25 is a drawing illustrating a modified example of insulators ofthe third exemplary embodiment;

FIG. 26A is a drawing illustrating the insulators illustrated in FIG. 25set in a jig and plural core configuration sections in an installedstate to second insulator portions;

FIG. 26B is a drawing illustrating cut off of bridging sections in theinsulators illustrated in FIG. 26A;

FIG. 26C is a drawing illustrating the insulators illustrated in FIG.26B with portions other than the second insulator portions having beenraised, and the second insulator portions having been slid;

FIG. 26D is a drawing illustrating the insulators illustrated in FIG.26C in a state with portions other than the second insulator portionshaving been lowered, and first insulator portions in an installed stateto core configuration sections;

FIG. 27 is a perspective view illustrating a stator according to afourth exemplary embodiment of the present invention;

FIG. 28A is an exploded perspective view illustrating a U-phase statorconfiguration section illustrated in FIG. 27;

FIG. 28B is an exploded perspective view illustrating a V-phase statorconfiguration section illustrated in FIG. 27;

FIG. 28C is an exploded perspective view illustrating a W-phase statorconfiguration section illustrated in FIG. 27;

FIG. 29 is a perspective view illustrating an interlocking structure ofthe fourth exemplary embodiment of the present invention;

FIG. 30 is a perspective view illustrating a process of assemblingtogether plural stator configuration sections illustrated in FIG. 27;

FIG. 31 is a perspective view illustrating a modified example of aninsulator of the fourth exemplary embodiment of the present invention;

FIG. 32 is a perspective view illustrating a modified example ofinsulators of the fourth exemplary embodiment of the present invention;

FIG. 33 is a perspective view illustrating a modified example ofinsulators of the fourth exemplary embodiment of the present invention;

FIG. 34 is a drawing illustrating an interlocking structure of a fifthexemplary embodiment of the present invention;

FIG. 35 is a drawing illustrating a modified example of an interlockingstructure of the fifth exemplary embodiment of the present invention;

FIG. 36 is a drawing illustrating a modified example of an interlockingstructure of the fifth exemplary embodiment of the present invention;

FIG. 37 is a drawing illustrating a modified example of an interlockingstructure of the fifth exemplary embodiment of the present invention;

FIG. 38 is a drawing illustrating an interlocking structure of a sixthexemplary embodiment of the present invention;

FIG. 39 is a perspective view illustrating a stator according to aseventh exemplary embodiment of the present invention;

FIG. 40A is a perspective view illustrating a U-phase statorconfiguration section illustrated in FIG. 39;

FIG. 40B is a perspective view illustrating a V-phase statorconfiguration section illustrated in FIG. 39;

FIG. 40C is a perspective view illustrating a W-phase statorconfiguration section illustrated in FIG. 39;

FIG. 41A is a perspective view illustrating a process in which pluralstator configuration sections illustrated in FIG. 39 are being assembledtogether;

FIG. 41B is a perspective view illustrating a state in which assemblyhas progressed further than in FIG. 41A;

FIG. 42 is a cross-section illustrating a schematic configuration of abrushless motor provided with the stator illustrated in FIG. 39;

FIG. 43 is a perspective view illustrating a modified example of a coilwire illustrated in FIG. 39;

FIG. 44 is a perspective view illustrating a stator according to aneighth exemplary embodiment of the present invention;

FIG. 45A is a perspective view illustrating a U-phase statorconfiguration section illustrated in FIG. 44;

FIG. 45B is a perspective view illustrating a V-phase statorconfiguration section illustrated in FIG. 44;

FIG. 45C is a perspective view illustrating a W-phase statorconfiguration section illustrated in FIG. 44;

FIG. 46A is a perspective view illustrating a process in which pluralstator configuration sections illustrated in FIG. 44 are being assembledtogether;

FIG. 46B is a perspective view illustrating a state in which assemblyhas progressed further than in FIG. 46A;

FIG. 47 is a cross-section illustrating a schematic configuration of abrushless motor provided with the stator illustrated in FIG. 44;

FIG. 48 is a plan view to explain winding of a coil wire using a flyermachine;

FIG. 49 is a plan view to explain a manner in which a coil wire ispressed using a press;

FIG. 50 is an expanded area drawing to explain a manner in which awinding portion is pressed;

FIG. 51 is an exploded perspective view illustrating a stator accordingto a ninth exemplary embodiment of the present invention;

FIG. 52 is a plan view illustrating an assembled state of the statorillustrated in FIG. 51;

FIG. 53 is a plan view illustrating a brushless motor provided with astator according to a tenth exemplary embodiment of the presentinvention;

FIG. 54A is a plan view illustrating a first group stator configurationsection illustrated in FIG. 53;

FIG. 54B is a plan view illustrating a second group stator configurationsection illustrated in FIG. 53;

FIG. 54C is a plan view illustrating a third group stator configurationsection illustrated in FIG. 53;

FIG. 55 is an enlarged plan view of relevant portions of the statorillustrated in FIG. 53; and

FIG. 56 is a drawing to explain winding a coil wire in a statoraccording to a comparative example.

DESCRIPTION First Exemplary Embodiment of the Present Invention

Explanation first follows regarding a first exemplary embodiment of thepresent invention, with reference to FIG. 1 to FIG. 4.

A stator 10 according to the first exemplary embodiment illustrated inFIG. 1 is a stator employed in an inner rotor type brushless motor, andis configured including a U-phase stator configuration section 12U, aV-phase stator configuration section 12V and a W-phase statorconfiguration section 12W, as illustrated in FIG. 2A to FIG. 2C.

As illustrated in FIG. 2A, the U-phase stator configuration section 12Uis configured with plural core configuration sections 14U, a coil wire16U, and an insulator 18U. The plural core configuration sections 14Uconfigure a core 20, together with plural V-phase core configurationsections 14V and plural W-phase core configuration sections 14W,described later (see FIG. 1 for each). The core configuration sections14U respectively include plural yoke configuration sections 22U andplural teeth sections 24U.

The plural yoke configuration sections 22U configure a ring shaped yoke40, together with V-phase yoke configuration sections 22V and W-phaseyoke configuration sections 22W, described later (see FIG. 1 for each),and are respectively circular arc shaped. The plural teeth sections 24Uare integrally formed to the respective yoke configuration sections 22U,and project from the yoke configuration sections 22U towards a radialdirection inside from the yoke 40 (see FIG. 1).

The coil wire 16U configures the U-phase and includes plural windingportions 26U and plural crossing wires 28U. The plural winding portions26U are wound concentrically on the teeth sections 24U, with insulatorportions 32U, described later, disposed therebetween. The windingportions 26U are mutually connected to each other by the plural crossingwires 28U. The crossing wires 28U are connected to the plural windingportions 26U and are laid (wound) around the outer peripheral face of aconnection portion 34U formed to the insulator 18U, described later.Terminal portions 30U at both end sides of the coil wire 16U lead outfrom the teeth sections 24U to a first axial direction side (the arrowZ1 side) of the stator 10. The crossing wires 28U are positioned on thesame side in a first axial direction as the terminal portions 30U.

The insulator 18U is made from a resin, and includes integral pluralinsulator portions 32U and the connection portion 34U. The number ofplural insulator portions 32U provided is the same as the number of theplural teeth sections 24U mentioned above. The plural insulator portions32U project out on a yoke configuration sections 22U side (a yoke 40side in FIG. 1) with respect to the connection portion 34U, describedlater. Each of the plural insulator portions 32U includes an insulatormain body portion 32U1 and an extending portion 32U2. The insulator mainbody portions 32U1 are integrated to respective surfaces of the pluralcore configuration sections 14U mentioned above, for example by integralmolding or interlock mounting. The insulator main body portions 32U1insulate between the teeth sections 24U formed to the core configurationsections 14U and the winding portions 26U. The extending portions 32U2are positioned further to the radial direction inside than the coreconfiguration sections 14U, and extend from the insulator main bodyportion 32U1 to the first axial direction side (the arrow Z1 side) ofthe yoke 40.

The connection portion 34U is disposed displaced with respect to theplural insulator portions 32U at the yoke 40 first axial direction side(the arrow Z1 side) and is formed in a ring shape. The connectionportion 34U connects together the plural insulator portions 32U (or morespecifically, extension end portions (end portions on the Z1 side) ofthe extending portions 32U2 in the plural insulator portions 32U), andis positioned further to the yoke 40 radial direction inside (the radialdirection inside of the yoke 40 illustrated in FIG. 1) than the coreconfiguration sections 14U. Plural projection shaped retaining portions36U project out towards a radial direction outside from between theplural insulator portions 32U on the outer peripheral face of theconnection portion 34U. The retaining portions 36U retain the crossingwires 28U mentioned above from a second axial direction side (arrow Z2side) of the connection portion 34U. Plural notches 38U opening towardsthe second axial direction side (arrow Z2 side) are formed to theconnection portion 34U between the plural insulator portions 32U.

The V-phase stator configuration section 12V illustrated in FIG. 2B hasbasically the same configuration as the U-phase stator configurationsection 12U mentioned above. Namely, the V-phase stator configurationsection 12V is configured including the plural V-phase yokeconfiguration sections 22V, plural teeth sections 24V, a coil wire 16Vand an insulator 18V. The plural yoke configuration sections 22V, theplural teeth sections 24V, the coil wire 16V and the insulator 18Vcorrespond to the above mentioned plural yoke configuration sections22U, the plural teeth sections 24U, the coil wire 16U and the insulator18U (see FIG. 2A for each). Note that in the V-phase statorconfiguration section 12V, a connection portion 34V is formed in a ringshape, and formed with a smaller diameter than the U-phase connectionportion 34U mentioned above (see FIG. 2A). Moreover, retaining portions36V retain the crossing wires 28V from the first axial direction side(the arrow Z1 side) of the connection portion 34V, and are positionedfurther to the radial direction inside than the core configurationsections 14V.

Moreover, each of the plural insulator portions 32V includes aninsulator main body portion 32V1 and an extending portion 32V2. Theinsulator main body portions 32V1 are integrated to respective surfacesof the plural core configuration sections 14V mentioned above, forexample by integral molding or interlock mounting. The insulator mainbody portions 32V1 insulate between the teeth sections 24V formed to thecore configuration sections 14V and the winding portions 26V. Theextending portions 32V2 are positioned further to the radial directioninside than the core configuration sections 14V, and extend along a yoke40 circumferential direction from the insulator main body portions 32V1.The connection portion 34V is provided at the first axial direction side(the arrow Z1 side) of the plural insulator portions 32V. The connectionportion 34V is formed in a ring shape, connects together the pluralinsulator portions 32V, and is positioned further to the radialdirection inside than the core configuration sections 14V.

The W-phase stator configuration section 12W illustrated in FIG. 2C hasbasically the same configuration as the U-phase stator configurationsection 12U mentioned above. Namely, the W-phase stator configurationsection 12W is configured including the plural W-phase yokeconfiguration sections 22W, plural teeth sections 24W, a coil wire 16Wand an insulator 18W. The plural yoke configuration sections 22W, theplural teeth sections 24W, the coil wire 16W and the insulator 18Wcorrespond to the above mentioned plural yoke configuration sections22U, the plural teeth sections 24U, the coil wire 16U and the insulator18U (see FIG. 2A for each). Note that in the W-phase statorconfiguration section 12W, a connection portion 34W is formed in a ringshape, and formed with a smaller diameter than the V-phase connectionportion 34V mentioned above (see FIG. 2B). The above mentioned notches(see the notches 38U in FIG. 2A) are omitted from the connection portion34W. Moreover, retaining portions 36W retain the crossing wires 28W fromthe first axial direction side (the arrow Z1 side) of the connectionportion 34W, and are positioned further to the radial direction insidethan the core configuration sections 14W.

Moreover, each of the plural insulator portions 32W includes aninsulator main body portion 32W1 and an extending portion 32W2. Theinsulator main body portions 32W1 are integrated to respective surfacesof the plural core configuration sections 14W mentioned above, forexample by integral molding or interlock mounting. The insulator mainbody portions 32W1 insulate between the teeth sections 24W formed to thecore configuration sections 14W and the winding portions 26W. Theextending portions 32W2 are positioned further to the radial directioninside than the core configuration sections 14W, and extend from theinsulator main body portions 32W1 towards a radial direction inside ofthe yoke 40. The connection portion 34W is provided at the first axialdirection side (the arrow Z1 side) of the plural insulator portions 32W.The connection portion 34W is formed in a ring shape, connects togetherthe plural insulator portions 32W (or more specifically, extension endportions (end portions on the radial direction inside) of the extendingportions 32W2 in the plural insulator portions 32W), and is positionedfurther to the radial direction inside than the core configurationsections 14W.

As illustrated in FIG. 1, the plural stator configuration sections 12U,12V, 12W are, as explained in detail later, assembled together toconfigure the stator 10. Moreover, in the stator 10, the ring shapedyoke 40 is configured by the plural yoke configuration sections 22U,22V, 22W. In other words, the yoke 40 is segmented in thecircumferential direction into the plural yoke configuration sections22U, 22V, 22W. Each of the plural yoke configuration sections 22U, 22V,22W is fitted between a respective pair of yoke configuration sectionsadjacent on both sides.

The plural connection portions 34U, 34V, 34W are disposed at the radialdirection inside of the yoke 40. The plural connection portions 34U,34V, 34W are disposed such that there are gaps present therebetween inthe yoke 40 radial direction and axial direction, and are providedcoaxially to the yoke 40. The V-phase retaining portions 36V are fittedagainst an inner peripheral face of the U-phase connection portion 34U,and the W-phase retaining portions 36W are fitted against an innerperipheral face of the V-phase connection portion 34V. The pluralconnection portions 34U, 34V, 34W are thus retained in a state separatedfrom each other in the radial direction. Namely, the retaining portions36U, 36V, 36W are provided between the plural connection portions 34U,34V, 34W in the radial direction, and serve as projection shaped spacersto retain the plural connection portions 34U, 34V, 34W in a stateseparated from each other in the radial direction.

Moreover, as mentioned above, in the state in which the pluralconnection portions 34U, 34V, 34W are disposed such that gaps arepresent therebetween in the yoke 40 radial direction, the V-phasecrossing wires 28V pass through inside the notches 38U formed at theU-phase connection portion 34U (are housed inside the notches 38U), andthe W-phase crossing wires 28W pass through inside the notches 38Uformed at the U-phase connection portion 34U and inside the notches 38Vformed at the V-phase connection portion 34V (are housed inside thenotches 38U and the notches 38V (see FIG. 3B)). The notches 38U, 38V areexamples of a housing portion of the present invention.

As illustrated in FIG. 4, the stator 10 configured as described aboveconfigures an inner rotor type brushless motor 60, together with a rotor50 and a housing 70. Configuration in the brushless motor 60 is suchthat a rotational magnetic field is formed by the stator 10, and therotor 50 is rotated thereby. Note that the brushless motor 60 is forexample an 8-pole 12 slot motor.

Explanation follows regarding a manufacturing method of the stator 10configured as described above.

First, as illustrated in FIG. 2A, the core configuration sections 14Uare integrated to the insulator portions 32U of the insulator 18U toform a U-phase sub-assembly 42U configured from the insulator 18U andthe plural core configuration sections 14U. Similarly, as illustrated inFIG. 2B, the core configuration sections 14V are integrated to theinsulator portions 32V of the insulator 18V to form a V-phasesub-assembly 42V configured from the insulator 18V and the plural coreconfiguration sections 14V. Moreover, as illustrated in FIG. 2C, thecore configuration sections 14W are integrated to the insulator portions32W of the insulator 18W to form a W-phase sub-assembly 42W configuredfrom the insulator 18W and the plural core configuration sections 14W.The sub-assemblies 42U, 42V, 42W are thus formed for each of theU-phase, the V-phase and the W-phase (the sub-assembly forming process).

Next, as illustrated in FIG. 2A, a flyer machine 100 (see FIG. 5) isemployed to wind the coil wire 16U on each of the teeth sections 24U ofthe U-phase sub-assembly 42U from the radial direction outside, formingthe U-phase stator configuration section 12U with plural windingportions 26U formed at the sub-assembly 42U. Note that the flyer machine100 is, as illustrated in FIG. 5, configured including a flyer 101 thatwinds the coil wires 16 in a circular motion so as to circle theperiphery of each of the teeth sections 24, a variable former 102 thataligns the coil wires 16 wound onto the teeth sections 24, and a drivecircuit 103 that controls the flyer 101 and the variable former 102.

Similarly, as illustrated in FIG. 2B, the flyer machine 100 mentionedabove is employed to wind the coil wire 16V on each of the teethsections 24V of the V-phase sub-assembly 42V from the radial directionoutside, forming the V-phase stator configuration section 12V withplural winding portions 26V formed at the sub-assembly 42V. Moreover, asillustrated in FIG. 2C, the flyer machine 100 mentioned above isemployed to wind the coil wire 16W on each of the teeth sections 24W ofthe W-phase sub-assembly 42W from the radial direction outside, formingthe W-phase stator configuration section 12W with plural windingportions 26W formed on the sub-assembly 42W.

When this is performed, as illustrated in FIG. 2A, the plural crossingwires 28U are laid out along the outer peripheral face of the connectionportion 34U. The plural crossing wires 28U are also retained from thesecond axial direction side (arrow Z2 side) of the connection portion34U by the projection shaped retaining portions 36U. Similarly, asillustrated in FIG. 2B, the plural crossing wires 28V are laid out alongthe outer peripheral face of the connection portion 34V. The pluralcrossing wires 28V are also retained from the first axial direction side(the arrow Z1 side) of the connection portion 34V by the projectionshaped retaining portions 36V. Moreover, as illustrated in FIG. 2C, theplural crossing wires 28W are laid out along the outer peripheral faceof the connection portion 34W. The plural crossing wires 28W are alsoretained from the connection portion 34W from the first axial directionside (the arrow Z1 side) by the projection shaped retaining portions36W.

Moreover, as illustrated in FIG. 2A, the terminal portions 30U at thetwo end sides of the coil wire 16U are led out from the teeth sections24U to the first axial direction side (the arrow Z1 side) of the stator10. Similarly, as illustrated in FIG. 2B, the terminal portions 30V atthe two end sides of the coil wire 16V are led out from the teethsections 24V towards the first axial direction side of the stator 10.Moreover, as illustrated in FIG. 2C, the terminal portions 30W at thetwo end sides of the coil wire 16W are led out from the teeth sections24W towards the first axial direction side of the stator 10. The statorconfiguration sections 12U, 12V, 12W are thus formed for each of theU-phase, the V-phase and the W-phase (the stator configuration sectionforming process).

Then, as illustrated in FIG. 3A and FIG. 3B, in a state in which theV-phase stator configuration section 12V is displaced by a specificangle in a circumferential direction with respect to the W-phase statorconfiguration section 12W, the V-phase stator configuration section 12Vis assembled to the W-phase stator configuration section 12W from thefirst axial direction side (the arrow Z1 side). Then, in a state inwhich the U-phase stator configuration section 12U is displaced by aspecific angle in a circumferential direction with respect to theV-phase stator configuration section 12V, the U-phase statorconfiguration section 12U is assembled to the V-phase statorconfiguration section 12V and the W-phase stator configuration section12W from the first axial direction side (the arrow Z1 side).

When this is performed, each of the plural yoke configuration sections22U, 22V, 22W is fitted between a pair of yoke configuration sectionsrespectively adjacent on both sides. Moreover, the V-phase retainingportions 36V are fitted against the inner peripheral face of the U-phaseconnection portion 34U, and the W-phase retaining portions 36W arefitted against the inner peripheral face of the V-phase connectionportion 34V. The plural connection portions 34U, 34V, 34W are thusretained in a state separated from each other in the radial direction bythe projection shaped retaining portions 36U, 36V, 36W.

Moreover, when this is performed, the V-phase crossing wires 28V passthrough inside the notches 38U formed at the U-phase connection portion34U, and the W-phase crossing wires 28W pass through inside the notches38U formed at the U-phase connection portion 34U and through inside thenotches 38V formed at the V-phase connection portion 34V. The pluralstator configuration sections 12U, 12V, 12W are thus assembled togetherto form the stator 10 (stator forming process). Note that the terminalportions 30U, 30V, 30W are connected by a buzz bar or the like, notshown in the drawings. The stator 10 is accordingly manufactured by theabove processes.

Explanation follows regarding operation and advantageous effects of thefirst exemplary embodiment.

Note that in the following explanation, for convenience the letters U,V, W are omitted as suffixes to the labels of each member and eachportion when no discrimination is made between the U-phase, the V-phaseand the W-phase.

According to the stator 10 of the first exemplary embodiment, the yoke40 is configured by the plural yoke configuration sections 22 segmentedin the circumferential direction. Therefore, even in a stator employedin a so-called inner rotor type brushless motor in which plural teethsections 24 project towards radial direction inside of the yoke 40, thesub-assemblies 42 for each of the U-phase, V-phase and W-phase areformed as described above, and the coil wires 16 can be wound using theflyer machine 100 (see FIG. 5) onto each of the teeth sections 24 of thesub-assemblies 42 from the radial direction outside. There isaccordingly no need to secure space between the teeth sections 24, aswould be required when a nozzle machine is employed, enabling a higherdense arrangement of the coil wires 16 to be achieved, and enabling amore compact stator 10 to be realized.

Moreover, as described above, the yoke 40 is segmented in thecircumferential direction into the plural yoke configuration sections22, and so, for example, the stator 10 can be made more compact in theaxial direction in comparison to cases in which the yoke 40 is segmentedinto plural yoke configuration sections in the axial direction.

Moreover, when the flyer machine 100 is employed, since the windingspeed of the coil wires 16 is higher than when using a nozzle machine,the process of winding the coil wires 16 can be speeded up, andaccordingly a reduction in cost of the stator 10 can be achieved due toreducing the number of equipment units.

Moreover, the notches 38U, 38V are formed in the U-phase connectionportion 34U and the V-phase connection portion 34V, for the crossingwires 28V, 28W to pass through inside. Interference between theconnection portions 34U, 34V and the crossing wires 28V, 28W can therebybe avoided, and the length of the crossing wires 28V, 28W can besuppressed from increasing. The stator 10 can accordingly be made evenmore compact and at even lower cost.

Moreover, in the U-phase stator configuration section 12U, the extendingportions 32U2 are positioned further to the radial direction inside thanthe core configuration sections 14U. Interference between the flyer ofthe flyer machine and the extending portions 32U2 and the connectionportion 34U can accordingly be suppressed when winding the coil wire 16Uon the teeth sections 24U from the radial direction outside using theflyer machine.

Moreover, in the V-phase stator configuration section 12V and in theW-phase stator configuration section 12W, the connection portions 34V,34W are respectively positioned further to the radial direction insidethan the core configuration sections 14V, 14W. Interference between theflyer of the flyer machine and the connection portion 34V, 34W canaccordingly be suppressed during winding the coil wires on therespective teeth sections 24V, 24W from the radial direction outsideusing the flyer machine.

Each of the connection portions 34 includes the retaining portions 36that retain the respective crossing wires 28 laid on the respectiveconnection portion itself. Therefore, for example as stated above, thecrossing wires 28 can be retained at the connection portions 34 by meansof the retaining portions 36 when forming the stator 10 by assemblingtogether the plural stator configuration sections 12, and so efficientoperation can be achieved when assembling together the plural statorconfiguration sections 12. Moreover, even after the stator 10 has beenincorporated into the brushless motor, the crossing wires 28 areretained at the connection portions 34 by means of the retainingportions 36, and so flapping of the crossing wires 28 can be suppressed,enabling noise and fault occurrence to be suppressed.

The plural connection portions 34 can also be retained in a stateseparated from each other in the radial direction by the projectionshaped retaining portions 36. Space for laying out the crossing wires 28between the plural connection portions 34 can accordingly be secured inthe radial direction, and rattling of the plural connection portions 34can also be suppressed. Better operating efficiency can also be achievedwhen assembling the plural connection portions 34 together than in casesin which the plural connection portions 34 are fitted together aroundthe whole circumference.

Moreover, the plural yoke configuration sections 22 are integrallyformed to the teeth sections 24. Magnetic loss at each of the connectionportions can accordingly be suppressed compared with, for example, atwo-part type core including independent members of plural teethsections with leading end portions connected together with thinnedbridging sections and a yoke that connects together base end portions ofthe teeth sections. Namely, magnetic loss occurs at three locations in atwo-part type core, namely at the bridging sections between the leadingend portions of adjacent pairs of teeth sections, at the base endportions of pairs of teeth sections, and at connection portions of theyoke. In contrast thereto, in the stator 10 of the present exemplaryembodiment, magnetic loss only occurs at one location, the connectionportion between adjacent pairs of the yoke configuration sections 22,enabling magnetic loss to be reduced. It is accordingly possible toachieve even greater compactness and reduction in weight.

Moreover, a buzz bar to connect the plural winding portions 26 is notrequired since the plural winding portions 26 are connected together bythe crossing wires 28. A reduction in the number of components canaccordingly be made, thereby also enabling a reduction in cost.

Moreover, the crossing wires 28 can be wound onto each of the connectionportions 34, and so the winding speed of the coil wires 16 can beraised, and a process to align the crossing wires 28 after winding thecoil wires 16 can be dispensed with. A decrease in cost can also beachieved as a result.

Moreover, the brushless motor according to the first exemplaryembodiment is equipped with the stator 10 as described above, and sogreater compactness and a decrease in cost can also be achieved.

Moreover, in the stator manufacturing method according to the firstexemplary embodiment, the sub-assemblies 42 are formed for each of theU-phase, V-phase and W-phase, and the coil wires 16 are wound on each ofthe teeth sections 24 of the sub-assemblies 42 from the radial directionoutside using the flyer machine 100. There is accordingly no need tosecure space between the teeth sections 24, as would be required when anozzle machine is employed. A higher dense arrangement of the coil wires16 is thereby enabled, and a more compact stator 10 can be realized.

Moreover, due to employing the flyer machine 100, the winding speed ofthe coil wires 16 is higher than when a nozzle machine is employed, andso the process of winding the coil wires 16 can be speeded up, andthereby a reduction in cost of the stator 10 can be achieved due toreducing the number of equipment units.

The connection portions 34 are provided coaxially to the yoke 40,enabling the structure to be simplified. The retaining portions 36 arealso formed in projection shapes, thereby also enabling the structure tobe simplified.

Explanation follows regarding modified examples of the first exemplaryembodiment.

In the first exemplary embodiment, the brushless motor is configured asan example by an 8-pole 12 slot motor, however configuration may be madewith a motor having another combination of numbers of poles and numbersof slots.

The connection method of the plural coil wires 16U, 16V, 16W may beconfigured in a star connection pattern or a delta connection pattern,both in series or in parallel, as illustrated in FIG. 6.

The retaining portions 36 function for retaining the crossing wires 28and also function as projection shaped spacers for retaining the pluralconnection portions 34 in a state separated from each other in theradial direction. However, retaining portions 36 and spacers may beindependently provided.

Moreover, the retaining portions 36 are formed at all of the connectionportions 34. However, the retaining portions 36U, 36W may be omittedfrom the U-phase connection portion 34U and the W-phase connectionportion 34W. In their place, spacers formed separately at the retainingportions 36 may be provided at the outer peripheral face and the innerperipheral face of the V-phase connection portion 34V, to fit againstthe inner peripheral face of the U-phase connection portion 34U and theouter peripheral face of the W-phase connection portion 34W.

The connection portions 34 are only provided at the first axialdirection side (Z1 side) of the plural insulator portions 32U, howeverconnection portions may be provided only on the second axial directionside (Z2 side) of the plural insulator portions 32U or on both axialdirection sides of the plural insulator portions 32U.

Moreover, the connection portions 34 are provided coaxially to the yoke40, however connection portions may be provided so as not to be coaxialto the yoke 40. The connection portions 34 are also formed in ringshapes, however connection portions may be formed in another shape, suchas a polygonal shape or for example a shape with a portion missing suchas a C-shape.

The crossing wires 28V, 28W, serving as an example of a member of thepresent invention, are housed in the notches 38U, 38V, however differentmember may be housed.

The retaining portions 36 are formed in projection shapes, however theretaining portions 36 may be formed in a circular arc shape extendingaround the circumferential direction of the stator 10, or in anothershape.

The extending portions 32U2 are only formed to the U-phase insulator18U, however similar extending portions to the extending portions 32U2may be formed to the V-phase insulator 18V and to the W-phase insulator18W.

The connection portion 34U is positioned further to the radial directioninside than the core configuration sections 14U. However, asschematically illustrated in FIG. 15, as long as the insulator 18U hasextending portions 32U2 positioned further to the radial directioninside than the core configuration sections 14U, the connection portion34U may be positioned further to the radial direction outside than thecore configuration sections 14U. Moreover, as long as the extendingportions 32U2 are positioned further to the radial direction inside thanthe core configuration sections 14U, the extending portions 32U2 mayextend in one direction of axial direction, radial direction, or adirection that is a combination thereof of the yoke 40. Although theconnection portion 34U is provided on the first axial direction side (Z1side) of the insulator portions 32U and connects together the extensionend portions of the extending portions 32U2 extending in the yoke 40axial direction, configuration may be made, for example as illustratedin FIG. 16, with the extending portions 32U2 extending in the yoke 40circumferential direction, and the connection portion 34U extending inthe yoke 40 circumferential direction and connecting the extension endportions of the extending portions 32U2. Moreover, in cases in which theextending portions 32U2 extend in one direction of the yoke 40 axialdirection, radial direction, or a direction that is a combinationthereof, the connection portion 34U may connect the extension endportions of the extending portions 32U2, and may also connect otherlocations of the extending portions 32U2 other than the extension endportions. The above also similarly applies to cases in which extendingportions and a connection portion are formed to the V-phase insulator18V and the W-phase insulator 18W.

Moreover, as illustrated in FIG. 20A, the plural connection portions34U, 34V, 34W are disposed such that there are gaps present between eachother in the yoke 40 radial direction and axial direction. However,configuration may be made with the connection portions 34U, 34V, 34Wdisposed such that there are gaps present between each other in the yoke40 axial direction, as illustrated in FIG. 20B, or disposed such thatthere are gaps present between each other in the yoke 40 radialdirection, as illustrated in FIG. 20C. A space can also be secured insuch configurations for laying the crossing wires 28 between the pluralconnection portions 34U, 34V, 34W.

Although the stator 10 is also configured for use in a so-called innerrotor type brushless motor in which the plural teeth sections 24 projecttowards the yoke 40 radial direction inside, the stator 10 may also beconfigured for use in a so-called outer rotor type brushless motor inwhich plural teeth sections 24 project towards the yoke 40 radialdirection outside.

Moreover, the stator 10 is configured segmented into the statorconfiguration sections 12U, 12V, 12W configured for each of the pluralphases, as an example of plural groups. However, as illustrated in FIG.17 and FIG. 18A to FIG. 18C, the stator 10 may be segmented into statorconfiguration sections 12A, 12B, 12C configured by groups eachcontaining a combination of plural phases.

Note that, for example, in the examples illustrated in FIG. 17 and FIG.18A to FIG. 18C, a stator configuration section 12A configuring a firstgroup includes +U-phase teeth sections 24U and −W-phase teeth sections24W, and a stator configuration section 12B configuring a second groupincludes +V-phase teeth sections 24V and −U-phase teeth sections 24U.Moreover, a stator configuration section 12C configuring a third groupincludes +W-phase teeth sections 24W and −V-phase teeth sections 24V.Note that the brushless motor of this example is a 10-pole 12 slot or a14-pole 12 slot motor. The coil wire is reverse wound on the −U-phase,−V-phase, and −W-phase teeth sections.

Although not particularly illustrated, as an example of a differentcombination, configuration may be made such that for example: a statorconfiguration section 12A configuring the first group includes +U-phaseteeth sections and −V-phase teeth sections; a stator configurationsection 12B configuring a second group includes +V-phase teeth sectionsand −U-phase teeth sections; and a stator configuration section 12Cconfiguring a third group includes +W-phase teeth sections and −W-phaseteeth sections.

Moreover, configuration may be made such that: a stator configurationsection 12A configuring a first group includes +U-phase teeth sectionsand −U-phase teeth sections; a stator configuration section 12Bconfiguring a second group includes +V-phase teeth sections and −V-phaseteeth sections; and a stator configuration section 12C configuring athird group includes +W-phase teeth sections and −W-phase teethsections.

Moreover, configuration may be made such that: a stator configurationsection 12A configuring a first group includes +U-phase teeth sectionsand −U-phase teeth sections; a stator configuration section 12Bconfiguring a second group includes +V-phase teeth sections and −W-phaseteeth sections; and a stator configuration section 12C configuring athird group includes +W-phase teeth sections and −V-phase teethsections.

In addition to the above, configuration may also be made with statorconfiguration sections configuring each of the groups including teethsections of plural phases in a combination other than those listedabove.

Second Exemplary Embodiment of the Present Invention

Explanation follows regarding a second exemplary embodiment of thepresent invention, with reference to FIG. 7 to FIG. 9.

The configuration of a stator 110 according to the second exemplaryembodiment of the present invention varies from the stator 10 accordingto the first exemplary embodiment described above in the followingmanner. Note that in the second exemplary embodiment of the presentinvention, configuration similar to that of the first exemplaryembodiment described above is allocated the same reference numerals andexplanation thereof is abbreviated.

As illustrated in FIG. 7, elongated plate shaped conductive terminalstations 112U, 112V, 112W are respectively provided to each of pluralinsulators 18U, 18V, 18W. Terminal portions 30U, 30V, 30W of plural coilwires 16U, 16V, 16W are respectively connected to the terminal stations112U, 112V, 112W. The terminal stations 112U, 112V, 112W are provided ata first axial direction side of a yoke 40 (the arrow Z1 side), namely atthe same side as connection portions 34. Tongue shaped connectorportions 113U, 113V, 113W are formed respectively to the terminalstations 112U, 112V, 112W for connecting to the terminal portions 30U,30V, 30W.

Moreover, as illustrated in FIG. 8, in the U-phase insulator 18U,projection portions 114U are formed at end portions of each of insulatorportions 32U on the opposite side to the yoke 40 (to yoke configurationsections 22U). The projection portions 114U project out to a yoke 40side from a connection portion 34U. The projection portions 114U areformed in a plate shape extending along a yoke 40 axial direction, andare thicker than the connection portion 34U. End faces 114U1 are formedat the projection portions 114U, facing towards the yoke 40 first axialdirection side (the arrow Z1 side). An insertion groove 116U is formedto the end face 114U1 of one of the insulator portions 32U, opening inthe yoke 40 axial direction. The terminal station 112U is provided atthe projection portion 114U by inserting (push-fitting) into theinsertion groove 116U. The terminal station 112U also projects outfurther than the connection portion 34U in the yoke 40 axial direction.

Moreover, as illustrated in FIG. 7, similarly to with the terminalstation 112U, insertion grooves 116V, 116W are also respectively formedto end faces of projection portions 114V, 114W of one of respectiveinsulator portions 32V, 32W, and terminal stations 112V, 112W areprovided to the projection portions 114V, 114W by inserting(push-fitting) into the insertion grooves 116V, 116W. The terminalstations 112U, 112V, 112W make contact with an outer peripheral face34U1 (the surface on the yoke 40 side) of the connection portion 34U.

As illustrated in FIG. 8, groove shaped guide portions 118U are alsoformed at the insulator 18U along the yoke 40 axial direction (see FIG.7). The guide portions 118U are, more specifically, formed to side faces114U2 of the projection portions 114U (side faces facing in the yoke 40circumferential direction). The terminal portions 30U of the coil wire16U are guided by the guide portions 118U. Note that the terminalportions 30U in this case are, for example, fitted into the grooveshaped guide portions 118U with a snap fit.

Moreover, as illustrated in FIG. 7, guide portions 118V, 118W similar tothe guide portions 118U described above are also formed to side faces ofthe projection portions 114V, 114W, and the terminal portions 30V, 30Wof the coil wires 16V, 16W are guided by the guide portions 118V, 118W.

Explanation follows regarding points in which operation and advantageouseffects of the second exemplary embodiment of the present inventiondiffer from those of the first exemplary embodiment described above.

Note that in the following explanation, for convenience the letters U,V, W are omitted as suffixes to the labels of each member and eachportion when no discrimination is made between the U-phase, the V-phaseand the W-phase.

According to the stator 110 of the second exemplary embodiment of thepresent invention, the terminal stations 112 are respectively providedto the plural insulators 18, and the terminal portions 30 of therespective plural coil wires 16 are connected to the terminal stations112. Positioning of the terminal portions 30 can accordingly beperformed easily.

Moreover, the terminal stations 112 project out further in the yoke 40axial direction than the connection portions 34, and so as illustratedin FIG. 8, the terminal stations 112 and a control circuit section canbe easily connected together.

Moreover, the terminal stations 112 are provided to the projectionportions 114 that project out towards the yoke 40 side with respect tothe connection portions 34. Interference between the terminal stations112 and the connection portions 34 can accordingly be suppressed, andthe terminal portions 30 can be easily positioned.

Moreover, the terminal stations 112 are inserted into the insertiongrooves 116 formed to the projection portions 114, enabling the terminalstations 112 to be easily fixed to the projection portions 114.

The terminal stations 112 make contact with the outer peripheral face34U1 of the connection portion 34U, and rattling of the terminalstations 112 can be suppressed.

The guide portions 118 are also formed to the respective pluralinsulators 18 along the yoke 40 axial direction, and the respectiveterminal portions 30 of the plural coil wires 16 are guided by the guideportions 118. This also enables positioning of the terminal portions tobe performed easily.

The guide portions 118 are also provided to the projection portions 114that project out to the yoke 40 side with respect to the connectionportions 34. Interference between the terminal portions 30 and theconnection portions 34 can accordingly be suppressed, and the terminalportions 30 can be positioned easily.

Explanation follows regarding modified examples of the second exemplaryembodiment of the present invention.

In the exemplary embodiment described above, the projection portions 114are formed to each of the insulator portions 32, however projectionportions may only be formed to the insulator portions 32 that aredisposed with the terminal stations 112, out of the plural insulatorportions 32.

The guide portions 118U, 118V, 118W are also formed in groove shapes,however they may be configured in a shape other than a groove shape.

The terminal stations 112 may also connect each of the terminal portions30 as neutral points.

Moreover, as illustrated in FIG. 10, the terminal stations 112U, 112V,112W described above may be provided on the yoke 40 axial directionopposite side to the crossing wires 28 (the connection portions 34).Such a configuration enables connection to be performed easily betweenthe terminal stations 112 and a control circuit section at the axialdirection opposite side to the crossing wires 28.

Moreover, as illustrated in FIG. 11, the terminal stations 112 describedabove (see FIG. 7 to FIG. 9) may be omitted. In such cases, the terminalportions 30 may be connected directly to a control circuit section andnot through the terminal stations 112 described above.

Although the guide portions 118 are formed respectively to side faces114U2 on both sides of the projection portions 114, the guide portions118 may only be formed to one of the side faces 114U2 of the projectionportions 114.

As illustrated in FIG. 12 and FIG. 13, configuration may be made suchthat an insertion groove 126 is formed to yoke configuration sections 22of one of the plural yoke configuration sections 22, opening in the yoke40 axial direction, and with the terminal station 112 provided to thisyoke configuration section 22 by inserting into the insertion groove126. Such a configuration also enables positioning of the terminalportions 30 to be performed easily. Moreover, inserting the terminalstations 112 into the insertion groove 126 formed to the yokeconfiguration sections 22 enables the terminal stations 112 to be fixedto the yoke configuration sections 22 easily.

Moreover, configuration may be made with the connector portion 113formed in a groove shape, as illustrated in FIG. 12, or formed as atongue shape, as illustrated in FIG. 13. Note that in the caseillustrated in FIG. 12, a covering of the terminal portion 30 is peeledoff at the same time as insertion of the terminal station 112 into theinsertion groove 126 is performed, and electrical continuity is madebetween the terminal portion 30 and the terminal station 112. However,in the case illustrated in FIG. 13, an operator hooks the terminalportion 30 onto the connector portion 113 by hand, and electricalcontinuity is made between the terminal portion 30 and the terminalstation 112.

As illustrated in FIG. 14, the plural insulator portions 32 may beconnected by circular arc shaped reinforcement portions 128 at anopposite side to the yoke 40 axial direction to the connection portions34 (the arrow Z2 side). Such a configuration enables the rigidity of theinsulators 18 to be raised.

Moreover, in order to raise the rigidity of the insulators 18,configuration may be made with a reinforcement member 130 such as ametal ring or wire, buried in the connection portions 34 by insertmolding. Configuration may also be made such that the insulators 18 areconfigured with the connection portions 34 formed from a high strengthresin, and portions other than the connection portions 34 formed from anormal strength resin by employing two-color molding.

Examples of Application of the Second Exemplary Embodiment of thePresent Invention

Explanation follows regarding examples of application of the secondexemplary embodiment of the present invention, with reference to FIG.19.

A fluid pump 210 illustrated in FIG. 19 is applied with the stator 110described above. The fluid pump 210 is equipped, in addition to thestator 110 and the control circuit section 120 described above, with apump housing 212, a motor housing 214, an end housing 216, an impeller218, a rotor 220 and a motor shaft 222. The stator 110 and the rotor 220configure a brushless motor.

In the fluid pump 210, a rotational magnetic field is formed by thestator 110 when current is supplied to the stator 110 from the controlcircuit section 120, thereby rotating the impeller 218 together with therotor 220. When the impeller 218 rotates, fluid is sucked in through asuction inlet 230 and conveyed into a pump chamber 228, and then thefluid conveyed into the pump chamber 228 is discharged through adischarge outlet 232.

According to the fluid pump 210 (brushless motor), greater compactnessand lower cost can be realized due to being equipped with the stator110.

Third Exemplary Embodiment of the Present Invention

Explanation follows regarding a third exemplary embodiment of thepresent invention, with reference to the drawings.

A stator 310 according to the third exemplary embodiment of the presentinvention is illustrated in FIG. 21, and is employed for example in aninner rotor type brushless motor, and is configured including a U-Phasestator configuration section 312U, a V-phase stator configurationsection 312V and a W-phase stator configuration section 312W,illustrated in FIG. 22A to FIG. 22C.

As illustrated in FIG. 21 and FIG. 22A, the U-phase stator configurationsection 312U is configured with plural core configuration sections 314U,a coil wire 316U, and an insulator 318U. Note that the coil wire 316U isomitted from illustration in FIG. 22A.

The plural core configuration sections 314U configure a stator core 320together with plural V-phase core configuration sections 314V and pluralW-phase core configuration sections 314W, described later. Each of thecore configuration sections 314U includes a teeth section 322U and ayoke configuration section 324U. The teeth sections 322U extend along aradial direction of the stator core 320, and the yoke configurationsections 324U are formed to leading end portions of the teeth sections322U. The yoke configuration sections 324U configure a ring shaped yoke326, together with plural V-phase yoke configuration sections 324V andplural W-phase yoke configuration sections 324W, described later, andare respectively circular arc shaped.

The coil wire 316U illustrated in FIG. 21 configures the U-phase andincludes plural coil wire winding portions 328U and plural crossingwires 330U. In the plural coil wire winding portions 328U, the coil wire316U is wound concentrically on the teeth sections 322U of the coreconfiguration sections 314U, with teeth section insulator portions 342U,352U, described later, disposed therebetween. The coil wire windingportions 328U are connected to each other by the plural crossing wires330U. The crossing wires 330U are laid out (wrapped) around the outerperipheral face of a connection portion 336U formed to the insulator318U, described later. Terminal portions 332U at both end sides of thecoil wire 316U are led out from the core configuration sections 314U toa first axial direction side (the arrow Z1 side) of the stator core 320.

The insulator 318U is made from a resin, and includes the pluralinsulator portions 334U and the connection portion 336U that have beenintegrated together, as illustrated in FIG. 22A. The number of theplural insulator portions 334U provided is the same as the number of theplural core configuration sections 314U mentioned above, and theinsulator portions 334U are disposed at even intervals in a ring shape.Each of the plural insulator portions 334U includes a first insulatorportion 340U and a second insulator portion 350U segmented in an axialdirection of the stator core 320.

The first insulator portion 340U and the second insulator portion 350Urespectively include the teeth section insulator portions 342U, 352U,yoke configuration section insulator portions 344U, 354U, and extensionside wall portions 346U, 356U. The teeth section insulator portions342U, 352U, the yoke configuration section insulator portions 344U,354U, and the extension side wall portions 346U, 356U together configurean insulator main body portion 360U that insulates between the coreconfiguration sections 314U and the coil wire winding portions 328U (seeFIG. 21). The teeth section insulator portions 342U, 352U are installedto the teeth sections 322U from both axial direction sides of the statorcore 320 and are configured to cover the teeth sections 322U. The yokeconfiguration section insulator portions 344U, 354U are formed atleading end portions of the teeth section insulator portions 342U, 352U,are installed to the yoke configuration sections 324U from both axialdirection sides of the stator core 320, and are configured to coverportions of the yoke configuration sections 324U other than the outerperipheral face.

The extension side wall portions 346U, 356U are respectively formed atbase end portions of the teeth section insulator portions 342U, 352U.The extension side wall portions 346U, 356U are formed as plate shapesextending along the stator core 320 axial direction with their platethickness direction aligned with a radial direction of the stator core320. The extension side wall portions 346U, 356U are formed along thestator core 320 circumferential direction and are wider in width thanthe teeth section insulator portions 342U, 352U mentioned above.

The guide grooves 348U, 358U that extend along the stator core 320 axialdirection are respectively formed at side portions in a circumferentialdirection of the stator core 320 of the extension side wall portions346U, 356U. The guide grooves 348U, 358U are present to guide theterminal portions 332U (see FIG. 21). An extending portion 362U isformed at the extension side wall portions 346U of the first insulatorportion 340U, extending towards a first axial direction side of thestator core 320. An extension end portion of the extending portion 362Uis connected to a connection portion 336U, described later.

The connection portion 336U is disposed at the stator core 320 firstaxial direction side (the arrow Z1 side) with respect to the insulatorportions 334U, and is formed in a ring shape along the stator core 320circumferential direction. The connection portion 336U is provided at aradial direction inside of the stator core 320 with respect to the teethsection insulator portions 342U, 352U. Projection shaped retainingportions 364U are respectively formed at an outer peripheral face of theconnection portion 336U between the plural insulator portions 334U so asto project towards outside of the stator core 320 radial direction. Theretaining portions 364U retain the crossing wires 330U mentioned abovefrom a second axial direction side of the stator core 320 (the arrow Z2side) (see FIG. 21). Moreover, portions between the plural extendingportions 362U of the connection portion 336U are formed with notches366U open to the stator core 320 second axial direction side.

The V-phase stator configuration section 312V illustrated in FIG. 21 andFIG. 22B has a similar basic configuration to the U-phase statorconfiguration section 312U mentioned above. Namely, the V-phase statorconfiguration section 312V is configured including plural coreconfiguration sections 314V, a coil wire 316V and an insulator 318V.Note that the coil wire 316V is omitted from illustration in FIG. 22B.

Each of the core configuration sections 314V is configured similarly tothe core configuration sections 314U mentioned above, and includes ateeth section 322V and a yoke configuration section 324V.

The coil wire 316V illustrated in FIG. 21 configures the V-phase andincludes plural coil wire winding portions 328V and plural crossingwires 330V. In the plural coil wire winding portions 328V, the coil wire316V is wound concentrically on the teeth sections 322V of the coreconfiguration sections 314V, with teeth section insulator portions 342V,352V, described later, disposed therebetween. The coil wire windingportions 328V are connected to each other by the plural crossing wires330V. The crossing wires 330V are laid out (wrapped) around the outerperipheral face of a connection portion 336V formed to the insulator318V, described later. Terminal portions 332V at both end sides of thecoil wire 316V are led out from the core configuration sections 314V toa first axial direction side (the arrow Z1 side) of the stator core 320.

The insulator 318V is made from a resin, and includes plural insulatorportions 334V and the connection portion 336V that have been integratedtogether, as illustrated in FIG. 22B. The number of the plural insulatorportions 334V provided is the same as the number of the plural coreconfiguration sections 314V mentioned above, and the insulator portions334V are disposed at even intervals in a ring shape. Each of the pluralinsulator portions 334V includes a first insulator portion 340V and asecond insulator portion 350V segmented in an axial direction of thestator core 320.

The first insulator portion 340V and the second insulator portion 350Vrespectively include the teeth section insulator portions 342V, 352V,yoke configuration section insulator portions 344V, 354V and extensionside wall portions 346V, 356V. The teeth section insulator portions342V, 352V, the yoke configuration section insulator portions 344V, 354Vand the extension side wall portions 346V, 356V together configure aninsulator main body portion 360V that insulates between the coreconfiguration sections 314V and the coil wire winding portions 328V (seeFIG. 21). The insulator main body portion 360V is configured similarlyto the insulator main body portion 360U mentioned above.

Guide grooves 348V, 358V that extend along the stator core 320 axialdirection are respectively formed to side portions in a circumferentialdirection of the stator core 320 of the extension side wall portions346V, 356V. The guide grooves 348V, 358V are present to guide theterminal portions 332V mentioned above (see FIG. 21). An extendingportion 362V is also formed at each of the extension side wall portions346V of the first insulator portion 340V, extending towards inside inthe stator core 320 radial direction. An extension end portion of theextending portion 362V is connected to a connection portion 336V,described later.

The connection portion 336V is disposed at the stator core 320 firstaxial direction side (the arrow Z1 side) with respect to the insulatorportions 334V. The connection portion 336V is formed in a circular ringplate shape extending along a circumferential direction of the statorcore 320 and with a plate thickness direction aligned with the statorcore 320 axial direction. The connection portion 336V is provided atinside in the stator core 320 radial direction with respect to the teethsection insulator portions 342V, 352V. Projection shaped retainingportions 364V are respectively formed at the outer peripheral face ofthe connection portion 336V between the plural insulator portions 334Vso as to project outside in the stator core 320 radial direction. Theretaining portions 364V retain the crossing wires 330V mentioned abovefrom a second axial direction side of the stator core 320 (the arrow Z2side) (see FIG. 21). Moreover, portions between the plural extendingportions 362V of the connection portion 336V are formed with notches366V open to the stator core 320 second axial direction side.

The W-phase stator configuration section 312W illustrated in FIG. 21 andFIG. 22C has a similar basic configuration to the U-phase statorconfiguration section 312U and the V-phase stator configuration section312V mentioned above. Namely, the W-phase stator configuration section312W is configured including the plural core configuration sections314W, a coil wire 316W and an insulator 318W. Note that the coil wire316W is omitted from illustration in FIG. 22C.

Each of the core configuration sections 314W is configured similarly tothe core configuration sections 314U, 314V mentioned above, and includesa teeth section 322W and a yoke configuration section 324W.

The coil wire 316W illustrated in FIG. 21 configures the W-phase andincludes plural coil wire winding portions 328W and plural crossingwires 330W. In the plural coil wire winding portions 328W, the coil wire316W is wound concentrically on the teeth sections 322W of the coreconfiguration sections 314W, with teeth section insulator portions 342W,352W, described later, disposed therebetween. The coil wire windingportions 328W are connected to each other by the plural crossing wires330W. The crossing wires 330W are laid out (wrapped) around the outerperipheral face of a connection portion 336W formed to the insulator318W, described later. Terminal portions 332W at both end sides of thecoil wire 316W are led out from the core configuration sections 314W toa first axial direction side (the arrow Z1 side) of the stator core 320.

The insulator 318W is made from a resin, and includes plural insulatorportions 334W and the connection portion 336W that have been integratedtogether, as illustrated in FIG. 22C. The number of the plural insulatorportions 334W provided is the same as the number of the plural coreconfiguration sections 314W mentioned above, and the insulator portions334W are disposed at even intervals in a ring shape. Each of the pluralinsulator portions 334W includes a first insulator portion 340W and asecond insulator portion 350W segmented in an axial direction of thestator core 320.

The first insulator portion 340W and the second insulator portion 350Wrespectively include the teeth section insulator portions 342W, 352W,yoke configuration section insulator portions 344W, 354W and extensionside wall portions 346W, 356W. The teeth section insulator portions342W, 352W, the yoke configuration section insulator portions 344W, 354Wand the extension side wall portions 346W, 356W together configure aninsulator main body portion 360W that insulates between the coreconfiguration sections 314W and the coil wire winding portions 328W (seeFIG. 21). The insulator main body portion 360W is configured similarlyto the insulator main body portions 360U, 360V mentioned above.

Guide grooves 348W, 358W that extend along an axial direction of thestator core 320 are respectively formed at side portions in acircumferential direction of the stator core 320 at the extension sidewall portions 346W, 356W. The guide grooves 348W, 358W are present toguide the terminal portions 332W mentioned above (see FIG. 21). Anextending portion 362W is also formed to each of the extension side wallportions 346W of the first insulator portion 340W, extending towardsinside in the stator core 320 radial direction. An extension end portionof the extending portion 362W is connected to a connection portion 336W,described later.

The connection portion 336W is disposed at the first axial directionside of the stator core 320 (the arrow Z1 side) with respect to theinsulator portions 334W, and formed in a ring shape extending in acircumferential direction along the stator core 320. The connectionportion 336W is provided at the stator core 320 radial direction insidewith respect to the teeth section insulator portions 342W, 352W. Theconnection portion 336W includes a circular ring shaped retainingportion 364W with its plate thickness direction aligned with the statorcore 320 axial direction, and a ring shaped spacer 368W that extendsfrom locations at an radial direction inner side of the retainingportion 364W towards the first axial direction side of the stator core320. The retaining portion 364W retains the crossing wires 330W from asecond axial direction side of the stator core 320 (the arrow Z2 side)(see FIG. 21).

As illustrated in FIG. 21, the plural stator configuration sections312U, 312V, 312W are assembled together to configure the stator 310. Inthe stator 310, the ring shaped stator core 320 is configured by theplural core configuration sections 314U, 314V, 314W, and the ring shapedyoke 326 is formed by the plural yoke configuration sections 324U, 324V,324W. In other words, the stator core 320 is segmented in thecircumferential direction into the plural core configuration sections314U, 314V, 314W, and the yoke 326 is segmented in the circumferentialdirection into the plural yoke configuration sections 324U, 324V, 324W.The plural yoke configuration sections 324U, 324V, 324W respectively fitbetween pairs of yoke configuration sections adjacent on the two sidesthereof.

The plural connection portions 336U, 336V, 336W are provided coaxiallyto the stator core 320. The plural connection portions 336U, 336V, 336Wand the plural extending portions 362U, 362V, 362W mentioned above arepositioned at the stator core 320 radial direction inside with respectto each of the core configuration sections 314U, 314V, 314W. Theconnection portion 336U is disposed at the radial direction outside ofthe connection portions 336V, 336W, with a gap present between theconnection portions 336V, 336W. The connection portion 336V is disposedat the first axial direction side of the connection portion 336W, with agap present between the connection portion 336V and the connectionportion 336W.

The V-phase retaining portions 364V are fitted against an innerperipheral face of the U-phase connection portion 336U, and theconnection portion 336U and the connection portion 336V are therebyretained in a state separated from each other in the radial direction.Namely, the retaining portions 364V are provided in the radial directionbetween the connection portion 336U and the connection portion 336V, andalso perform the role of spacers for retaining the connection portion336U and the connection portion 336V in a state separated from eachother in the radial direction. However, the spacers 368W make contactwith a face in the second axial direction side (the arrow Z2 side) ofthe V-phase connection portion 336V, thereby retaining the connectionportion 336V and the connection portion 336W in a state separated fromeach other in the axial direction.

Moreover, as mentioned above, in an assembled state of the pluralconnection portions 336U, 336V, 336W, the V-phase crossing wires 330Vpass through inside the notches 366U formed at the U-phase connectionportion 336U (are housed inside the notches 366U). The W-phase crossingwires 330W pass through inside the notches 366U, 366V formedrespectively at the U-phase connection portion 336U and the V-phaseconnection portion 336V (are housed inside the notches 366U, 366V). Thenotches 366U, 366V are examples of a housing portion of the presentinvention.

Explanation follows regarding a manufacturing method of the stator 310configured as described above.

Molding Process

First, as illustrated in FIG. 23A, the above insulator 318U is formed byresin molding. When this is performed, as illustrated in FIG. 23A, inthe insulator 318U, the second insulator portions 350U are formed so asto be adjacent to the first insulator portions 340U along tangentialdirections of the connection portion 336U, and bridging sections 370Uare formed so as to connect together the yoke configuration sectioninsulator portions 344U, 354U in the first insulator portions 340U andthe second insulator portions 350U.

Namely, in this molding process, the first insulator portions 340U andthe second insulator portions 350U are molded in a state connectedtogether by the bridging sections 370U. Moreover, when this isperformed, the plural second insulator portions 350U are each formeddisplaced to the same side (the same side in the connection portion 336Utangential direction) with respect to the respective first insulatorportions 340U. Each of the bridging sections 370U is also formed withthe same length as each other.

Note that, although in the insulator 318U the first insulator portions340U and the second insulator portions 350U are molded so as to haveU-shaped cross-section teeth section insulator portions 342U, 352Uopening in opposite directions to each other, the first insulatorportions 340U and the second insulator portions 350U may be molded so asto have U-shaped cross-section teeth section insulator portions 342U,352U opening in the same direction as each other.

Installation and Cutoff Process

Then, as illustrated in FIG. 24A, the insulator 318U is installed to ajig 380. When this is performed, the second insulator portions 350U aremounted to movable tables 382. Each of the plural core configurationsections 314U is then installed to the respective second insulatorportion 350U from the vertical direction upper side. Then, asillustrated in FIG. 24B, each of the bridging sections 370 is cut offusing a punching tool 384.

Positional Alignment Process

Next, as illustrated in FIG. 24C, the connection portion 336U is raised,together with the plural first insulator portions 340U, using a liftingtool 386. When this is performed, the first insulator portions 340U arepositioned at a higher position than the core configuration sections314U. The movable tables 382 are then slid, together with the secondinsulator portions 350U, in connection portion 336U tangentialdirections such that the core configuration sections 314U are positionedbelow the first insulator portions 340U.

Then, as illustrated in FIG. 24D, positional alignment is performedbetween the core configuration sections 314U installed to the secondinsulator portions 350U and the first insulator portions 340U. Thepositional alignment here is performed in a state in which the coreconfiguration sections 314U remain installed vertically above the secondinsulator portions 350U.

Installation Process

Then, as illustrated in FIG. 24D, the connection portion 336U is loweredby the lifting tool 386 together with the plural first insulatorportions 340U, and the first insulator portions 340U are installed onthe core configuration sections 314U installed to the second insulatorportions 350U. When this is performed, the first insulator portions 340Uare pressed against the core configuration sections 314U by a press tool388.

Coil Wire Winding Process

Then, as illustrated in FIG. 24E, using a flyer 390, the coil wire 316Uis wound on the core configuration sections 314U, with the firstinsulator portions 340U and the second insulator portions 350Uinterposed therebetween. The coil wire winding portions 328U are therebyformed with the coil wire 316U on the core configuration sections 314U.The stator configuration section 312U is completed by the aboveprocesses.

The stator configuration sections 312V, 312W are also manufacturedsimilarly to the stator configuration section 312U.

Namely, in the molding process, as illustrated in FIG. 23B, in theinsulator 318V the first insulator portions 340V and the secondinsulator portions 350V are integrally formed to the bridging sections370V for connecting together the first insulator portions 340V and thesecond insulator portions 350V. Moreover, as illustrated in FIG. 23C, inthe insulator 318W the first insulator portions 340W and the secondinsulator portions 350W are integrally formed to the bridging sections370W for connecting together the first insulator portions 340W and thesecond insulator portions 350W.

Then, in the installation and cutoff process, the plural coreconfiguration sections 314V, 314W are respectively installed to thesecond insulator portions 350V, 350W, and then each of the bridgingsections 370V, 370W are cut off. Moreover, in the positional alignmentprocess, positional alignment is performed between the coreconfiguration sections 314V, 314W installed to the second insulatorportions 350U, 350W and the first insulator portions 3340V, 340W, and inthe installation process, the first insulator portions 340V, 340W arethen installed to the core configuration sections 314V, 314W installedto the second insulator portions 350V, 350W.

Then, in the coil wire winding process, the coil wires 316V, 316W arewound on the core configuration sections 314V, 314W, thereby forming thecoil wire winding portions 328V, 328W with the coil wires 316V, 316W onthe core configuration sections 314V, 314W. The stator configurationsections 312V, 312W are completed by the above processes.

Then the stator 310 is completed by assembling together the pluralstator configuration sections 312U, 312V, 312W.

Explanation follows regarding operation and advantageous effects of thepresent exemplary embodiment.

Note that, in the following explanation, for convenience the letters U,V, W are omitted as suffixes to the labels of each member and eachportion when no discrimination is made between the U-phase, the V-phaseand the W-phase.

According to the manufacturing method of the stator 310 of the presentexemplary embodiment, in the molding process, the first insulatorportions 340 and the second insulator portions 350 of the insulators 318are integrally formed with the bridging sections 370 interposedtherebetween. The number of components required for assembling thestator 310 can accordingly be reduced compared to cases in which thefirst insulator portions 340 and the second insulator portions 350 areformed separately.

Moreover, in the installation and cutoff process, the bridging sections370 are cut off after the core configuration sections 314 have beeninstalled to the second insulator portions 350. Thus, when installingthe core configuration sections 314 to the second insulator portions350, and when setting the insulators 318 in the jig 380, the whole bodyof each of the insulators 318 including the second insulator portions350 can be set in the jig 380 all in one operation. The number ofprocesses for setting the insulators 318 in the jig 380 can accordinglybe reduced in comparison to cases in which the bridging sections 370 arecut off prior to installing the core configuration sections 314 in thesecond insulator portions 350.

Moreover, in the molding process, the plural first insulator portions340 arrayed in a ring shape are connected together by each of theconnection portions 336. Thus in the subsequent positional alignmentprocess, positional alignment can be easily performed between the coreconfiguration sections 314 installed to the second insulator portions350 and the first insulator portions 340.

In particular, in the molding process, the plural first insulatorportions 340 are arrayed in the ring shape at even intervalstherebetween, and the plural second insulator portions 350 are formeddisplaced to the same side with respect to each of the first insulatorportions 340. Each of the bridging sections 370 is also formed with thesame length as each other. Hence, the core configuration sections 314are installed to the second insulator portions 350 in the installationand cutoff process subsequent to the molding process. In the positionalalignment process, even when positional alignment between the coreconfiguration sections 314 and the first insulation portions 340 isperformed by moving the second insulator portions 350 with the installedcore configuration sections 314 with respect to the first insulatorportions 340, the movement distances of the plural second insulatorportions 350 can be made the same as each other. Positional alignmentbetween the core configuration sections 314 installed in the secondinsulator portions 350 and the first insulator portions 340 canaccordingly be performed even more easily.

Moreover, in the positional alignment process, positional alignment isperformed between the core configuration sections 314 and the firstinsulator portions 340 in a state in which the core configurationsections 314 have been installed from the vertical direction upper sidein the second insulator portions 350. The core configuration sections314 can accordingly be easily retained in an installed state in thesecond insulator portions 350, enabling positional alignment between thecore configuration sections 314 and the first insulator portions 340 tobe performed easily.

Moreover, according to the manufacturing method of the stator 310,plural of the insulators 318 are formed for a single stator core 320.Hence, the stator core 320 can be segmented into the plural statorconfiguration sections 312U, 312V, 312W by assembling each of the pluralcore configuration sections 314, which are segmented in the stator core320 circumferential direction, to each of the insulators 318. It isaccordingly possible to manufacture each of the stator configurationsections 312U, 312V, 312W, resulting in an easy assembly operation forthe stator core 320 (in particular easy winding operations of the coilwires 316).

Moreover, when the plural insulators 318U, 318V, 318W are assembledtogether, placement is made such that there are gaps present in thestator core 320 radial direction between the connection portion 336U andthe connection portions 336V, 336W, and placement is made such thatthere is a gap present in the stator core 320 axial direction betweenthe connection portion 336V and the connection portion 336W. Thusinterference between the plural connection portions 336U, 336V, 336W canbe suppressed when assembling the plural insulators 318U, 318V, 318Wtogether. Good operating efficiency can accordingly be achieved whenassembling the plural insulators 318U, 318V, 318W together.

Moreover, the notches 366U for housing the V-phase and W-phase crossingwires 330V, 330W, which are examples of another member, are formed inthe U-phase connection portion 336U, and the notches 366V for housingthe W-phase crossing wires 330W, which is an example of another member,are formed in the V-phase connection portion 336V. Therefore in theassembled state of the stator 310, interference between the connectionportion 336U and the crossing wires 330V, 330W and interference betweenthe connection portion 336V and the crossing wires 330W can be avoided.

Moreover, in each of the connection portions 336U, 336V, 336W, theretaining portions 364U, 364V, 364W are formed in order to respectivelyretain the crossing wires 330U, 330V, 330W. Good operating efficiencycan accordingly be achieved when assembling together the plural statorconfiguration sections 312U, 312V, 312W. Even after the stator 310 hasbeen incorporated in a brushless motor, the crossing wires 330U, 330V,330W are still retained at the connection portions 336U, 336V, 336W bythe retaining portions 364U, 364V, 364W, and so flapping of the crossingwires 330U, 330V, 330W can be suppressed, enabling the occurrence ofnoise and faults to be suppressed.

Moreover, the retaining portions 364V that function as spacers so as toretain the connection portion 336U and the connection portion 336V in astate separated from each other are formed to the connection portion336V, and the spacers 368W that retain the connection portion 336V andthe connection portion 336W in a state separated from each other areformed to the connection portion 336W. The plural connection portions336U, 336V, 336W can accordingly be retained in a state separated fromeach other in the assembled state of the stator 310. Space for, forexample, laying out the crossing wires 330V, 330W between the pluralconnection portions 336U, 336V, 336W can accordingly be secured, andrattling of the plural connection portions 336U, 336V, 336W can also besuppressed.

The plural connection portions 336U, 336V, 336W are provided coaxiallyto the stator core 320 when the plural insulators 318U, 318V, 318W havebeen assembled to the stator core 320. The structure of the stator 310can accordingly be simplified.

Each of the connection portions 336 is positioned to the radialdirection inside with respect to the stator core 320 when the pluralinsulators 318U, 318V, 318W are assembled to the stator core 320.Interference between the flyer 390 and the connection portions 336 canaccordingly be suppressed when using the flyer 390 to wind the coilwires 316 on the core configuration sections 314 from outside in theradial direction of the stator core 320.

The extending portions 362 also extend out from the insulator main bodyportions 360 (the extension side wall portions 346 of the firstinsulator portions 340) that insulate between the core configurationsections 314 and the coil wire winding portions 328, and the extendingportions 362 are connected together by the connection portions 336. Theextending portions 362 are positioned at the stator core 320 radialdirection inside with respect to the core configuration sections 314.Hence, interference between the flyer 390 and the extending portions 362and the connection portions 336 can be suppressed when using the flyer390 to wind the coil wires 316 on the core configuration sections 314from outside in the radial direction of the stator core 320.

Moreover, in the core configuration sections 314, the teeth sections 322are locations where the coil wires 316 are wound to form the coil wirewinding portions 328. Guide portions (the guide grooves 348, 358), forexample, for guiding the terminal portions 332 of the coil wires 316 arealso formed to base end sides of the teeth sections 322.

Regarding this point, according to the manufacturing method of thestator 310, the bridging sections 370 are formed so as to connectbetween the yoke configuration section insulator portions 344, 354 ofthe first insulator portions 340 and the second insulator portions 350.Although the bridging sections 370 is formed, it can accordingly besuppressed for the bridging sections 370 from influencing the coil wirewinding portions 328, the guide portions and the like.

Explanation follows regarding modified examples of the present exemplaryembodiment.

In the above exemplary embodiment the second insulator portions 350 areformed so as to be to adjacent to the first insulator portions 340 inthe connection portions 336 tangential direction. However, asillustrated in FIG. 25, the second insulator portions 350 may be formedso as to be adjacent to the first insulator portions 340 in theconnection portions 336 circumferential direction.

In the above exemplary embodiment, the second insulator portions 350 areconnected by the bridging sections 370 to only one of the firstinsulator portions 340 out of the two adjacent first insulator portions340 on the two sides of the second insulator portions 350. However, asillustrated in FIG. 25, the second insulator portions 350 may beconnected through the bridging sections 370 to each of the firstinsulator portions 340 of the two adjacent first insulator portions 340on the two sides of the second insulator portions 350.

Note that when the insulators 318 illustrated in FIG. 25 are employed,the stator configuration sections 312 are manufactured by a method thatis similar to the above manufacturing method, as illustrated in FIG. 26Ato FIG. 26D, but differs from the above manufacturing method in thefollowing points.

Namely, as illustrated in FIG. 26A, in the installation and cutoffprocess, movable tables capable of sliding in the connection portions336 circumferential direction are employed for the movable tables 382.Moreover, as illustrated in FIG. 26B, in the installation and cutoffprocess, plural bridging sections 370 arranged at intervals along theconnection portions 336 circumferential direction are cut off.Furthermore, as illustrated in FIG. 26C and FIG. 26D, in the positionalalignment process, the movable tables 382 are slid together with thesecond insulator portions 350U in the connection portion 336Ucircumferential direction such that the core configuration sections 314Uare positioned below the first insulator portions 340U. Note that theinstallation process and the coil wire winding process are similar tothose described above.

Similar operation and advantageous effects can be exhibited using thismanufacturing method to those of the manufacturing method of the aboveexemplary embodiment.

In the above exemplary embodiment, after the core configuration sections314 have been installed to the second insulator portions 350 in theinstallation and cutoff process, the first insulator portions 340 arethen installed to the core configuration sections 314 in the subsequentinstallation process. However, configuration may be made such that,after the first insulator portions 340 have been installed to the coreconfiguration sections 314 from the vertical direction upper side in theinstallation and cutoff process, the second insulator portions 350 arethen installed to the core configuration sections 314 from the verticaldirection lower side in a subsequent installation process.

Note that in such cases, a recessed and protruding interlockingstructure or a friction structure, or a jig or the like, not shown inthe drawings, may be employed in order to prevent the core configurationsections 314 from falling out from the first insulator portions 340. Thecore configuration sections 314 may also be installed to the firstinsulator portions 340 that have been resiliently deformed by forexample a jig, such that the core configuration sections 314 areretained in the first insulator portions 340 by rebound force of thefirst insulator portions 340.

Moreover, the insulators 318 may be configured in a vertically invertedstate to that described above, such that the first insulator portions340 are in a state opening upwards in the vertical direction, and thecore configuration sections 314 then installed to the first insulatorportions 340 from the vertical direction upper side in this state.

Moreover, in the above exemplary embodiment, the second insulatorportions 350 installed with the core configuration sections 314 aremoved with respect to the first insulator portions 340 in the positionalalignment process. However, the first insulator portions 340 may bemoved together with the connection portions 336 with respect to thesecond insulator portions 350 installed with the core configurationsections 314. Moreover, both the second insulator portions 350 installedwith the core configuration sections 314 and the first insulatorportions 340 may be moved.

In the installation and cutoff process, the bridging sections 370 arecut off after the core configuration sections 314 have been installed tothe second insulator portions 350, however the bridging sections 370 maybe cut off prior to installation of the core configuration sections tothe second insulator portions 350.

Moreover, although placement is made such that there are gaps presentbetween the connection portion 336U and the connection portions 336V,336W in the stator core 320 radial direction, and placement is made suchthat there is a gap present between the connection portion 336V and theconnection portion 336W in the stator core 320 axial direction, theplural connection portions 336U, 336V, 336W may be disposed such thatthere is a gap present in one direction out of the stator core 320radial direction and axial direction, or in a direction that is acombination thereof.

Moreover, although the notches 366U serving as an example of a housingportion are formed in the connection portion 336U for housing thecrossing wires 330V, 330W (for the crossing wires 330V, 330W to passthrough), and the notches 366V serving as an example of a housingportion are formed in the connection portion 336V for housing thecrossing wires 330W (for the crossing wires 330W to pass through), anotch shaped housing portion may for example be formed to the connectionportion 336W for housing another member other than the crossing wires330.

Moreover, although in the extending portions 362U extend from theextension side wall portions 346U towards the stator core 320 firstaxial direction side, the extending portions 362U may extend from theextension side wall portions 356U towards the stator core 320 secondaxial direction side.

Moreover, in the insulators 318U, 318V, 318W for each of the phases, theteeth section insulator portions 342, 352 and the yoke configurationsection insulator portions 344, 354, excluding the extension side wallportions 346, 356, may configure the insulator main body portions 360,and a portion of the extension side wall portions 346 extending in thestator core 320 circumferential direction from the teeth sectioninsulator portions 342 may also be configured as an extending portion.Similarly, the teeth section insulator portions 342, 352 and the yokeconfiguration section insulator portions 344, 354, excluding theextension side wall portions 346, 356, may configure the insulator mainbody portions 360, and a portion of the extension side wall portions 356extending in the stator core 320 circumferential direction from theteeth section insulator portions 352 may also be configured as anextending portion. Each of the extending portions may also be connectedby the connection portions 336.

In the insulators 318U, 318V, 318W for each of the phases, as long asthe extending portion 362 is positioned to the stator core 320 radialdirection inside with respect to the core configuration sections 314,the extending portion 362 may extend from the insulator main bodyportions 360 in one direction out of the stator core 320 axialdirection, radial direction, or circumferential direction, or adirection that is a combination thereof.

In the V-phase insulator 318V, the retaining portions 364V have afunction to act as retaining portions for retaining the crossing wires330 and a function to act as spacers to retain the connection portions336U, 336V in a stated separated from each other in the radialdirection. However a retaining portion and a spacer may be providedindependently from each other.

Moreover, although the plural connection portions 336U, 336V, 336W areprovided coaxially to the stator core 320, they may be provided notcoaxial to the stator core 320. Each of the connection portions 336U,336V, 336W are also formed in a ring shape, however they may be formedin another shape, such as a polygonal shape or a shape with a portionmissing such as a C-shape.

Each of the connection portions 336U, 336V, 336W are positioned to thestator core 320 radial direction inside with respect to the coreconfiguration sections 314, however as long as the extending portions362U, 362V, 362W are positioned to the stator core 320 radial directioninside with respect to the core configuration sections 314, each of theconnection portions 336U, 336V, 336W may be positioned at the statorcore 320 radial direction outside with respect to the core configurationsections 314.

Moreover, although the stator 310 is also configured for use in an innerrotor type brushless motor, the stator 310 may also be configured foruse in an outer rotor type brushless motor.

Moreover, although the stator 310 is segmented into the statorconfiguration sections 312U, 312V, 312W configured for each of theplural phases, as an example of plural groups, the stator 310 may besegmented into plural stator configuration sections configuring groupsthat each contain a combination of plural phases.

Moreover, in addition to the above, configuration may also be made withstator configuration sections configuring each of the groups includingother combinations of core configuration sections of plural phases.

Note that although the brushless motor applied with the stator 310according to the present exemplary embodiment is configured as anexample by an 8-pole 12 slot motor, configuration may be made with amotor having another combination of numbers of poles and numbers ofslots.

Moreover, the connection method of the plural coil wires 316 may beconfigured in star connection pattern or a delta connection pattern,both in series or in parallel.

Fourth Exemplary Embodiment

Explanation follows regarding a fourth exemplary embodiment of thepresent invention.

A stator 410 according to a fourth exemplary embodiment of the presentinvention illustrated in FIG. 27 has portions similar to those of thestator of the third exemplary embodiment. Explanation hence focuses ondiffering portions and explanation regarding similar portions is omittedas appropriate.

In the present exemplary embodiment, as illustrated in FIG. 27 and FIG.28A, in a U-phase stator configuration section 412U, a first connectionportion 436U is disposed at a first axial direction side (the arrow Z1side) of a stator core 420 and is formed in a ring shape extendingaround a circumferential direction of the stator core 420. The firstconnection portion 436U is provided further to a stator core 420 radialdirection inside than teeth section insulator portions 442U, 452U(namely, than winding portions 428U wound on teeth sections 422U). Axialdirection extending portions 447U extend from the first connectionportion 436U towards a stator core 420 second axial direction side(arrow Z2 side), and the leading end portions of the axial directionextending portions 447U are connected to end portions at the axialdirection first side of extension side wall portions 446U. The axialdirection extending portions 447U, the extension side wall portions446U, and extension side wall portions 456U configure an extendingportion 462U that is part of an insulator portion 434U.

Next, as illustrated in FIG. 27 and FIG. 28B, in a V-phase statorconfiguration section 412V, a first connection portion 436V is disposedat the first axial direction side (the arrow Z1 side) of the stator core420. The first connection portion 436V is formed in a circular ringplate shape extending around the stator core 420 circumferentialdirection and having its thickness direction aligned with the statorcore 420 axial direction. The first connection portion 436V is providedfurther to the stator core 420 radial direction inside than teethsection insulator portions 442V, 452V (namely, than winding portions428V wound on teeth sections 422V). Axial direction extending portions447V extend from the first connection portion 436V towards the statorcore 420 second axial direction side (arrow Z2 side). Moreover, radialdirection extending portions 449V also extend towards the stator core420 radial direction outside from leading end portions of the axialdirection extending portions 447V. Leading end portions of the radialdirection extending portions 449V are connected to end portions at thefirst axial direction side of extension side wall portions 446V. Theaxial direction extending portions 447V, the radial direction extendingportions 449V, the extension side wall portions 446V, and extension sidewall portions 456V configure an extending portion 462V that is part ofan insulator portion 434V.

Next, as illustrated in FIG. 27 and FIG. 28C, in a W-phase statorconfiguration section 412W, a first connection portion 436W is disposedat the first axial direction side (the arrow Z1 side) of the stator core420 and is formed in a ring shape extending around the circumferentialdirection of the stator core 420. The first connection portion 436W isprovided further to the stator core 420 radial direction inside thanteeth section insulator portions 442W, 452W (namely, than windingportions 428W wound on teeth sections 422W). Radial direction extendingportions 449W extend towards the stator core 420 radial directionoutside from the first connection portion 436W. Leading end portions ofthe radial direction extending portions 449W are connected to endportions at the axial direction first side of extension side wallportions 446W. The radial direction extending portions 449W, theextension side wall portions 446W, and extension side wall portions 456Wconfigure extending portions 462W that are part of insulator portions434W.

The first connection portion 436W mentioned above includes a circularring shaped retaining portion 464W that has a plate thickness directionaligned with the stator core 420 axial direction, and a ring shapedspacer 468W that extends from a location at the radial direction insideof the retaining portion 464W towards the first axial direction side ofthe stator core 420. The retaining portion 464W retains the crossingwires 430W mentioned above from the stator core 420 second axialdirection side (arrow Z2 side) (see FIG. 27).

Moreover, as illustrated in FIG. 29, second connection portions 438W areformed at the extension side wall portions 446W that are positioned onthe stator core 420 first axial direction side. The second connectionportions 438W are formed in circular arc shapes extending around thestator core 420 circumferential direction, and connect end portions atthe stator core 420 second axial direction side of the adjacentextension side wall portions 446W. The second connection portions 438Ware disposed further to the stator core 420 radial direction inside thanthe teeth section insulator portions 442W, 452W (namely than windingportions 428W wound on teeth sections 422W with the teeth sectioninsulator portions 442W, 452W interposed).

Then, as illustrated in FIG. 30, the stator configuration section 412U,the stator configuration section 412V and the stator configurationsection 412W (the insulator 418U, insulator 418V and the insulator 418W)are disposed in sequence from the stator core 420 first axial directionside towards the second axial direction side, thereby assembling theplural stator configuration sections 412U, 412V, 412W together. Whenthis is being performed, the plural stator configuration sections 412U,412V, 412W are assembled together such that plural core configurationmembers 414U, 414V, 414W are arranged in the sequence U-phase, V-phase,W-phase around the circumferential direction of the stator core 420.Thus, as illustrated in FIG. 27, the stator 410 is configured by theplural stator configuration sections 412U, 412V, 412W.

Moreover, as illustrated in FIG. 29, the plural insulators 418U, 418V,418W have an interlocking structure 470 for positioning with respect toeach other. Namely, recess shaped fitting portions 472 are formed at thesecond connection portions 438W. Protrusion shaped fitted-to portions474 onto which the fitting portions 472 fit are formed to insulatorportions 438U, 438V (more specifically, end portions at the stator core420 second axial direction side of the extension side wall portions446U, 446V) disposed between pairs of insulator portions 434W that areconnected together by the second connection portions 438W. The fittingportions 472 and the fitted-to portions 474 configuring the interlockingstructure 470 fit together with each other, thereby positioning andfixing the plural insulators 418U, 418V, 418W with respect to eachother.

The plural first connection portions 436U, 436V, 436W are positionedcoaxially to each other, and provided coaxially to the stator core 420.The plural first connection portions 436U, 436V, 436W and the pluralextending portions 462U, 462V, 462W mentioned above are also positionedfurther to the stator core 420 radial direction inside than each of theinsulator main body portions 460U, 460V, 460W (the core configurationmembers 414U, 414V, 414W).

The first connection portion 436V external diameter is smaller than thefirst connection portion 436U external diameter, and the firstconnection portion 436W external diameter is smaller than the firstconnection portion 436V external diameter. The first connection portion436U is disposed at the radial direction outside of the first connectionportions 436V, 436W, with a gap present to the first connection portions436V, 436W. The first connection portion 436V is disposed to the radialdirection outside and on the first axial direction side of the firstconnection portion 436W, with a gap present to the first connectionportion 436W.

The V-phase retaining portions 464V fit against an inner peripheral faceof the U-phase first connection portion 436U, thereby retaining thefirst connection portion 436U and the first connection portion 436V in astate separated from each other in the radial direction. Namely, theretaining portions 464V are provided in the radial direction between thefirst connection portion 436U and the first connection portion 436V, andperform as the spacers to retain the first connection portion 436U andthe first connection portion 436V in mutually separated state in theradial direction. The spacer 468W makes contact with a face at thesecond axial direction side (arrow Z2 side) of the V-phase firstconnection portion 436V, and thereby retains the first connectionportion 436V and the first connection portion 436W in mutually separatestate in the axial direction.

Moreover, as described above, in the mutually assembled state of theplural first connection portions 436U, 436V, 436W, the V-phase crossingwires 430V pass through inside notches 466U formed at the U-phase firstconnection portion 436U (are housed in the notches 466U). The W-phasecrossing wires 430W pass through inside the notches 466U, 466V formed atthe U-phase and V-phase first connection portions 436U, 436V (are housedin the notches 466U, 466V). The notches 466U, 466V are examples ofhousing portions of the present invention.

Explanation next follows regarding operation and advantageous effects ofthe fourth exemplary embodiment of the present invention.

As described in detail above, according to the stator 410 of the fourthexemplary embodiment of the present invention, as illustrated in FIG.29, in the insulator 418W, the plural insulator portions 434W (firstinsulator portions 440W) are connected by the second connection portions438W, as well as by the first connection portion 436W. The rigiditybetween the plural insulator portions 434W (the first insulator portions440W), and hence the rigidity of the plural insulator portions 434U,434V, 434W, can accordingly be secured by the second connection portions438W. As a result, rigidity can be secured for the stator 410 as a wholeafter assembly.

Moreover, the second connection portions 438W are separated in thestator core 420 axial direction with respect to the first connectionportions 436U, 436V, 436W. Well balanced rigidity can accordingly besecured after assembling the stator 410.

Out of the plural insulators 418U, 418V, 418W, the second connectionportions 438W are formed at the insulator 418W positioned furthest tothe stator core 420 second axial direction side when the pluralinsulators are arranged along the stator core 420 axial direction in astate prior to assembling the plural insulators (see FIG. 30). Hence,interference of the insulator portions 434U, 434V (the extension sidewall portions 446U, 446V) formed to the other insulators 418U, 418V withthe second connection portions 438W can be avoided when the pluralinsulators 418U, 418V, 418W are being assembled along the stator core420 axial direction.

Moreover, in the insulator 418W, the plural first insulator portions440W are connected together by the second connection portions 438W aswell as the first connection portions 436W. The plural first insulatorportions 440W can accordingly be easily assembled to the coreconfiguration member 414W by the second connection portions 438W, andthe plural first insulator portions 440W can also be stabilized andfixed thereby after assembly.

Out of the plural insulators 418U, 418V, 418W, the second connectionportions 438W are also formed to the insulator 418W that has the firstconnection portion 436W with the smallest external diameter. Hence,interference of the insulator portions 434U, 434V (the extension sidewall portions 446U, 446V) formed to the other insulators 418U, 418V withthe second connection portions 438W can be avoided when the otherinsulators 418U, 418V are being assembled to the insulator 418W from thestator core 420 first axial direction side.

Moreover, the second connection portions 438W are disposed further tothe stator core 420 radial direction inside than the teeth sectioninsulator portions 442W, 452W (namely, than winding portions 428W woundon teeth sections 422W with the teeth section insulator portions 442W,452W interposed). Thus, interference between a flyer and the secondconnection portions 438W can be avoided when for example coil wire 416Wis being wound onto the teeth sections 422U by using the flyer.

Moreover, the second connection portions 438W connect together theplural extending portions 462W (extension side wall portions 446W) inthe insulator 418W. Therefore, even though each of the insulatorportions 434W includes the respective extending portions 462W thatextend from the first connection portion 436W (the radial directionextending portions 449W, the extension side wall portions 446W, 456W),rigidity between the plural insulator portions 434W, and hence rigidityof the plural insulator portions 434U, 434V, 434W, can be secured.

In particular, the second connection portions 438W are formed to leadingend portions of the extension side wall portions 446W. Rigidity betweenthe plural insulator portions 434U, 434V, 434W can accordingly besecured efficiently.

Moreover, the stator 410 is formed with the second connection portions438W on only the insulator 418W. A simplified structure is accordinglyenabled.

Moreover, the plural insulators 418U, 418V, 418W have the interlockingstructure 470 for mutual positioning. The insulators 418U, 418V, 418Wcan accordingly be positioned with respect to each other by theinterlocking structure 470, thereby facilitating easy assembly of thestator 410.

In particular, the interlocking structure 470 includes the fittingportions 472 and the fitted-to portions 474, the fitting portions 472are formed to the second connection portions 438W, and the fitted-toportions 474 are formed to the insulator portions 434U, 434V positionedbetween pairs of the insulator portions 434W that are connected togetherby the second connection portions 438W. Fitting together of the fittingportions 472 and the fitted-to portions 474 can accordingly be easilyperformed.

Explanation follows regarding modified examples of the fourth exemplaryembodiment of the present invention.

In the exemplary embodiment described above the second connectionportions 438W are formed at the end portion on the stator core 420second axial direction side of the extension side wall portions 446W.However the second connection portions 438W may be formed between a baseend portion and an extension end portion of the extending portions 462W(namely between the base end portion of the radial direction extendingportions 449W and the end portions on the stator core 420 second axialdirection side of the extension side wall portions 446W). In such cases,as illustrated in FIG. 31, the second connection portions 438Wpreferably have inset portions 439W inset towards s center side of thefirst connection portion 436W such that interference with, for example,the other extension side wall portions 446U, 446V, 456U, 456V isavoided.

Moreover, although configuration is made such that the second connectionportions 438W connect together the plural first insulator portions 440W(the end portions on the stator core 420 second axial direction side ofthe extension side wall portions 446W), configuration may be made, asillustrated in FIG. 32, in which the second connection portions 438Wconnect together plural second insulator portions 450W (end portions onthe stator core 420 second axial direction side of the extension sidewall portions 456W) are connected together. When such a configuration isadopted, rigidity between the plural first insulator portions 440W andrigidity between the plural second insulator portions 450W can beincreased with good balance due to the first connection portion 436W andthe second connection portions 438W. Rigidity of the stator 410 as awhole after assembly can accordingly also be secured.

Moreover, in the modified example illustrated in FIG. 32, the pluralsecond insulator portions 450W are connected together by the secondconnection portions 438W. The plural second insulator portions 450W canaccordingly be easily assembled to the core configuration member 414Wusing the second connection portions 438W, enabling stability and fixingto be achieved after assembly.

When the plural second insulator portions 450W are connected by thesecond connection portions 438W, the fitting portions 472 may be formedto the second connection portions 438W. Note that in such cases, thefitted-to portions 474 illustrated in FIG. 29 are formed to end portionson the stator core 420 second axial direction side of the extension sidewall portions 456U, 456V. Adopting such a configuration positions thefirst insulator portions 440U, 440V, 440W and the second insulatorportions 450U, 450V, 450W with respect to each other during assembly,enhancing efficient assembly and enabling the first insulator portions440U, 440V, 440W and the second insulator portions 450U, 450V, 450W tobe stabilized and fixed.

Note that the fitting portions 472 may be omitted from the secondconnection portions 438W when the plural first insulator portions 440Ware connected together by the second connection portions 438W. In such aconfiguration, the plural first insulator portions 440W are connectedtogether by the second connection portions 438W in addition to by thefirst connection portion 436W, and so the plural first insulatorportions 440W can be easily assembled to the core configuration member414W by means of the second connection portions 438W, and enablingstabilization and fixing to be achieved after assembly.

As illustrated in FIG. 33, the plural first insulator portions 440W (theend portions on the stator core 420 first axial direction side and theend portions on the stator core 420 second axial direction side of theextension side wall portions 446W) may be connected together by thefirst connection portion 436W and the second connection portions 438W,and the plural second insulator portions 450W (the end portions on thestator core 420 second axial direction side of the extension side wallportions 456W) may be connected together by third connection portions478W. Adopting such a configuration enables the rigidity between theplural first insulator portions 440W and the rigidity between the pluralsecond insulator portions 450W to be raised by the first connectionportion 436W, the second connection portions 438W and the thirdconnection portions 478W. The rigidity of the stator 410 as a wholeafter assembly can hence also be raised.

Moreover, the fitting portions 472 may be formed to the third connectionportions 478W when the plural second insulator portions 450W areconnected together by the third connection portions 478W. Note that insuch cases, the fitted-to portions 474 illustrated in FIG. 29 are formedto end portions on the stator core 420 second axial direction side ofthe extension side wall portions 456U, 456V. Adopting such aconfiguration positions the first insulator portions 440U, 440V, 440Wand the second insulator portions 450U, 450V, 450W with respect to eachother during assembly, enhancing efficient assembly and enabling thefirst insulator portions 440U, 440V, 440W and the second insulatorportions 450U, 450V, 450W to be stabilized and fixed.

Although configuration is made such that the second connection portions438W are only formed at the insulator 418W, the second connectionportions 438W may be formed at the other insulators 418U, 418V, or maybe formed at all of the insulators 418U, 418V, 418W. Similarly, thethird connection portions 478W may also be formed at the otherinsulators 418U, 418V, or may be formed at all the insulators 418U,418V, 418W.

Although the first connection portion 436U and the first connectionportions 436V, 436W are disposed with a gap present therebetween in thestator core 420 radial direction, and the first connection portion 436Vand the first connection portion 436W are disposed with a gap presenttherebetween in the stator core 420 radial direction and axialdirection, the plural first connection portions 436U, 436V, 436W may bedisposed such that there is a gap present therebetween in any directionout of the stator core 420 radial direction or axial direction or adirection that is a combination thereof.

Moreover, although the fitting portions 472 are formed in recess shapes,and the fitted-to portions 474 are formed in protrusion shapes, thefitting portions 472 may be formed in protrusion shapes and thefitted-to portions 474 may be formed in recess shapes.

Although the stator 410 is configured for use in an inner rotor typebrushless motor, the stator 410 may also be configured for use in anouter rotor type brushless motor.

Moreover, although the stator 410 is configured segmented into thestator configuration sections 412U, 412V, 412W configured for each ofthe plural phases, as an example of plural groups, the stator 410 may besegmented into plural stator configuration sections configured by groupseach containing a combination of plural phases.

Moreover, in addition to the above, configuration may also be made withthe stator configuration sections configuring each of the groupsincluding teeth of plural phases in other combinations.

Note that although the brushless motor applied with the stator 410according to the present exemplary embodiment is configured as anexample by an 8-pole 12 slot motor, configuration may be made with amotor having another combination of numbers of poles and numbers ofslots.

Moreover, in the connection method of the plural coil wires 416 may beconfigured as a star connection or a delta connection both in series andin parallel.

Fifth Exemplary Embodiment

Explanation follows regarding a fifth exemplary embodiment of thepresent invention.

Note that in the following explanation, for convenience the letters U,V, W are omitted as suffixes to the labels of each member and eachportion when no discrimination is made between the U-phase, the V-phaseand the W-phase.

The fifth exemplary embodiment of the present invention illustrated inFIG. 34 has an interlocking structure 570 that differs from that of thefourth exemplary embodiment of the present invention in the followingrespects.

Namely, fitting portions 572 are formed at one member of adjacent yokeconfiguration section insulator portions 554, and fitting protrusions573 are formed to the fitting portions 572. Recess shaped fitted-toportions 574 are moreover formed at the other member of the adjacentyoke configuration section insulator portions 554. Insulator portions534 of any insulators 518 out of the plural insulators are accordinglyfixed together by the fitting portions 572 and the fitted-to portions574 fitting together.

When such a configuration is adopted, the rigidity between the pluralinsulator portions 534, and hence the rigidity of the stator 510 as awhole after assembly can also be secured by fixing the plural insulatorportions 534 together with the interlocking structure 570.

Moreover, since the fitting portions 572 are formed to one member ofadjacent yoke configuration section insulator portions 554, and thefitted-to portions 574 are formed to the other member of the adjacentyoke configuration section insulator portions 554, fitting together ofthe fitting portions 572 and the fitted-to portions 574 can be easilyaccomplished.

Note that, as illustrated in FIG. 35, the fitting portions 572 may beformed as recess shapes in one member of the adjacent yoke configurationsection insulator portions 554, and the fitted-to portions 574 may beformed as protrusion shapes on the other member of the adjacent yokeconfiguration section insulator portions 554.

Moreover, as illustrated in FIG. 36 and FIG. 37, the insulator portions534 may be sloped so as to approach each other on progression towards ansecond axial direction side (arrow Z2 side) of the stator 510. When sucha configuration is adopted, a gap between any given pair of insulatorportions 534 adjacent in the circumferential direction of the stator 510gets gradually tighter on progression towards the stator 510 secondaxial direction side (arrow Z2 side), and so plural yoke configurationsections 524 make close contact with each other after assembly of thestator 510. The yoke configuration sections 524 can thereby be assembledwithout rattling, enabling the magnetic path formed by the yokeconfiguration sections 524 to be more efficiently formed.

Sixth Exemplary Embodiment

Explanation follows regarding a sixth exemplary embodiment of thepresent invention.

In the sixth exemplary embodiment of the present invention illustratedin FIG. 38, the configuration of an interlocking structure 670 differsfrom that of the fifth exemplary embodiment of the present invention inthe following respects.

Namely, fitting portions 672U are formed to a first connection portion636U so as to extend towards the radial direction inside. Fittingprotrusions 673U are formed at leading end portions of the fittingportions 672U. Recess shaped fitted-to portions 674V are formed at afirst connection portion 636V.

Fitting portions 672V are also formed to the first connection portion636V so as to extend towards the radial direction inside. Fittingprotrusions 673V are also formed at leading end portions of the fittingportions 672V. Recess shaped fitted-to portions 674W are also formed ata first connection portion 636W. The first connection portions 636U,636V, 636W that serve as connection portions are fixed by the fittingportions 672U and the fitted-to portions 674V fitting together, and thefitting portions 672V and the fitted-to portions 674W fitting together.

When such a configuration is adopted, the rigidity between the pluralfirst connection portions 636U, 636V, 636W, and hence the rigidity ofthe stator as a whole after assembly, can be secured by the interlockingstructure 670 in which the plural first connection portions 636U, 636V,636W are fixed together.

Moreover, since the fitting portions 672U and the fitted-to portions674V are respectively formed to the first connection portions 636U,636V, fitting together of the fitting portions 672U and the fitted-toportions 674V can be easily accomplished. Moreover, since the fittingportions 672V and the fitted-to portions 674W are respectively formed tothe first connection portions 636V, 636W, fitting together of thefitting portions 672V and the fitted-to portions 674W can be performedeasily.

Note that the fitting portions 672U, 672V may be formed as recess shapesand the fitted-to portions 674V, 672W may be formed as protrusionshapes.

Seventh Exemplary Embodiment

Explanation follows regarding a seventh exemplary embodiment of thepresent invention, with reference to the drawings.

A stator 710 according to a seventh exemplary embodiment of the presentinvention illustrated in FIG. 39 has portions similar to those of thestator of the first exemplary embodiment. Explanation hence focuses ondiffering portions and explanation of similar portions is omitted asappropriate.

In the present exemplary embodiment, as illustrated in FIG. 39 and FIG.40A, in a U-phase stator configuration portion 712U, a coil wire 716Uconfiguring a U-phase includes plural winding portions 726U and pluralcrossing wires 728U. The coil wire 716U is formed continuously from oneend to the other end. The coil wire 716U is wound concentrically aroundthe plural winding portions 726U on teeth sections 724U, with insulatorportions 732U (insulator main body portions 733U), described later,respectively disposed therebetween. The winding portions 726U aremutually connected to each other by the plural crossing wires 728U. Thecrossing wires 728U are laid out (wrapped) around the outer peripheralface of a connection portion 734U formed to an insulator 718U, describedlater. Terminal portions 730U at both end sides of the coil wire 716U isled out from the teeth sections 724U to a first axial direction side(the arrow Z1 side) of the stator 710.

The insulator 718U is made from a resin, and includes plural insulatorportions 732U and a connection portion 734U that have been integratedtogether. The number of the plural insulator portions 732U provided isthe same as the number of the plural teeth sections 724U mentionedabove. The plural insulator portions 732U include insulator main bodyportions 733U, extension side wall portions 735U and radial directionextension portions 737U. The insulator main body portions 733U areintegrated to the respective surfaces of the plural core configurationsections 714U, for example by integral molding or interlock mounting.The insulator main body portions 733U insulate between the teethsections 724U formed to the core configuration sections 714U and thewinding portions 726U. The extension side wall portions 735U arepositioned further inside in a radial direction of the statorconfiguration section 712U than the core configuration sections 714U(than the insulator main body portions 733U). The radial directionextension portions 737U extend out in the radial direction of the statorconfiguration section 712U from the connection portion 734U. Theextension side wall portions 735U extend towards a second axialdirection side (Z2 side) of the stator configuration section 712U fromextending ends of the radial direction extension portions 737U andconnect together the insulator main body portions 733U and the radialdirection extension portions 737U. The extension side wall portions 735Uand the radial direction extension portions 737U configure extendingportions 739U that connect together the insulator main body portions733U and the connection portion 734U.

The connection portion 734U is provided at a first axial direction side(Z1 side) of the plural insulator portions 732U. The connection portion734U is formed in a ring shape, connects together the plural insulatorportions 732U (or more specifically, base end portions of the radialdirection extension portions 737U of the plural insulator portions732U), and is positioned further to a radial direction inside than thecore configuration sections 714U. Plural projection shaped retainingportions 736U project out from an outer peripheral face of theconnection portion 734U towards a radial direction outside between theplural insulator portions 732U. The retaining portions 736U retain thecrossing wires 728U mentioned above from the second axial direction side(arrow Z2 side) of the connection portion 734U.

A V-phase stator configuration section 712V illustrated in FIG. 40B hasa similar basic configuration to the U-phase stator configurationsection 712U described above. In the V-phase stator configurationsection 712V, a connection portion 734V is formed in a ring shape, andis formed with a smaller diameter than the U-phase connection portion734U described above (see FIG. 40A). Retaining portions 736V retaincrossing wires 728V from a first axial direction side (the arrow Z1side) of the connection portion 734V, and are positioned further to aradial direction inside than core configuration sections 714V.

The plural insulator portions 732V include insulator main body portions733V, extension side wall portions 735V and radial direction extensionportions 737V. The insulator main body portions 733V are integrated torespective surfaces of the plural core configuration sections 714V, forexample by integral molding or interlock mounting. The insulator mainbody portions 733V insulate between teeth sections 724V formed to thecore configuration sections 714V and winding portions 726V. Theextension side wall portions 735V are positioned further inside in aradial direction of the stator configuration section 712V than the coreconfiguration sections 714V (than the insulator main body portions733V). The radial direction extension portions 737V extend out in theradial direction of the stator configuration section 712V from theconnection portion 734V. The extension side wall portions 735V extendtowards a second axial direction side (Z2 side) of the statorconfiguration section 712V from extending ends of the radial directionextension portions 737V and connect together the insulator main bodyportions 733V and the radial direction extension portions 737V. Theextension side wall portions 735V and the radial direction extensionportions 737V configure extending portions 739V that connect togetherthe insulator main body portions 733V and the connection portion 734V.The connection portion 734V is provided at the first axial directionside (Z1 side) of the plural insulator portions 732V. The connectionportion 734V is formed in a ring shape, connects together the pluralinsulator portions 732V, and is positioned further to a radial directioninside than the core configuration sections 714V.

A W-phase stator configuration section 712W illustrated in FIG. 40C alsohas a similar basic configuration to the U-phase stator configurationsection 712U described above. In the W-phase stator configurationsection 712W, a connection portion 734W is formed in a ring shape, andis formed with a smaller diameter than the V-phase connection portion734V described above (see FIG. 40B). The retaining portions 736W retaincrossing wires 728W from a first axial direction side (the arrow Z1side) of a connection portion 734W, and are positioned further inside ina radial direction than the core configuration sections 714W.

The plural insulator portions 732W include insulator main body portions733W, extension side wall portions 735W and radial direction extensionportions 737W. The insulator main body portions 733W are integrated torespective surfaces of the plural core configuration sections 714W, forexample by integral molding or interlock mounting. The insulator mainbody portions 733W insulate between teeth sections 724W formed to thecore configuration sections 714W and winding portions 726W. Theextension side wall portions 735W are positioned further inside in aradial direction of a stator configuration section 712W than the coreconfiguration sections 714W (than the insulator main body portions733W). The radial direction extension portions 737W extend out in thestator configuration section 712W radial direction from the connectionportion 734W. The extension side wall portions 735W extend towards asecond axial direction side (Z2 side) of the stator configurationsection 712W from extending ends of the radial direction extensionportions 737W and connect together the insulator main body portions 733Wand the radial direction extension portions 737W. The extension sidewall portions 735W and the radial direction extension portions 737Wconfigure extending portions 739W that connect together the insulatormain body portions 733W and the connection portion 734W. The connectionportion 734W is provided at the first axial direction side (Z1 side) ofthe plural insulator portions 732W. The connection portion 734W isformed in a ring shape, connects together the plural insulator portions732W (or more specifically, extension end portions (end portions on theradial direction inside) of the extension side wall portions 735W of theplural insulator portions 732W), and is positioned further to the radialdirection inside than the core configuration sections 714W.

The plural connection portions 734U, 734V, 734W are disposed at a radialdirection inside of a yoke 740. The plural connection portions 734U,734V, 734W are disposed with gaps between each other in the yoke 740radial direction and axial direction, and are provided coaxially to theyoke 740. The V-phase retaining portions 736V fit against an innerperipheral face of the U-phase connection portion 734U, and the W-phaseretaining portions 736W fit against an inner peripheral face of theV-phase connection portion 734V. The plural connection portions 734U,734V, 734W are accordingly retained in a radial direction mutuallyseparated state. Namely, the retaining portions 736U, 736V, 736W areprovided in the radial direction between the plural connection portions734U, 734V, 734W, and also perform as projection shaped spacers thatretain the plural connection portions 734U, 734V, 734W in a radialdirection mutually separated state.

Moreover, as illustrated in FIG. 40A, out of the crossing wires 728Udescribed above, a crossing wire 728U1 connected to the winding startend portion of one of the winding portions 726U and a crossing wire728U2 connected to a winding finish end portion of this winding portion726U cross over at the radial direction extension portions 737U of theconnection portion 734U and the insulator portions 732U. The radialdirection extension portions 737U are examples of a connection vicinitybetween the connection portion 734U and the insulator portions 732U.Namely, in the present exemplary embodiment, as an example, intersectionportions 729U between the crossing wire 728U1 connected to the windingstart end portion of one of the winding portions 726U and the crossingwire 728U2 connected to a winding finish end portion of this windingportion 726U are disposed at positions overlapping with the radialdirection extension portions 737U as viewed along the statorconfiguration section 712U axial direction.

Moreover, as illustrated in FIG. 40B, 40C, the crossing wires 728V, 728Ware similar to the crossing wires 728U described above. Namely, asillustrated in FIG. 40B, intersection portions 729V between the crossingwire 728V1 connected to the winding start end portion of one of theV-phase winding portions 726V and the crossing wire 728V2 connected to awinding finish end portion of this winding portion 726V are disposed atpositions overlapping with the radial direction extension portions 737Vas viewed along the stator configuration section 712V axial direction.As illustrated in FIG. 40C, intersection portions 729W between thecrossing wire 728W1 connected to the winding start end portion of one ofthe W-phase winding portions 726W and the crossing wire 728W2 connectedto a winding finish end portion of this winding portion 726W aredisposed at positions overlapping with the radial direction extensionportions 737W as viewed along the stator configuration section 712Waxial direction.

Note that the U-phase stator configuration section 712U illustrated inFIG. 40A has terminal portions 730U connected to two of the windingportions 726U out of the four winding portions 726U, and has crossingwires 728U connected to the remaining two winding portions 726U. Out ofthe two winding portions 726U connected to these crossing wires 728U,one of the crossing wires 728U2 that is connected the winding finish endportion of a first of the winding portions 726U is in turn connected tothe winding start end portion of another of the winding portions 726U.The crossing wire 728U1 that is connected to the winding start endportion of one of the winding portions 726U is connected to the windingfinish end portion of one of the winding portions 726U out of the twowinding portions 726U connected to the terminal portions 730U. Acrossing wire 728U2 that is connected to the winding finish end portionof another of the winding portions 726U is connected to the windingstart end portion of the other winding portions 726U out of the twowinding portions 726U that are connected to the terminal portions 730U.Similar applies to the coil wires 716V, 716W illustrated in FIG. 40B andFIG. 40C.

As illustrated in FIG. 42, the stator 710 configured as described aboveconfigures an inner rotor type brushless motor 760, together with arotor 750 and a housing 770. Configuration in the brushless motor 760 issuch that a rotational magnetic field is formed by the stator 710, andthe rotor 750 is rotated thereby. Note that the brushless motor 760 isfor example an 8-pole 12 slot motor.

Explanation follows regarding a manufacturing method of the stator 710configured as described above.

First, as illustrated in FIG. 40A, the core configuration sections 714Uare integrated to the insulator portions 732U of the insulator 718U toform a U-phase sub-assembly 742U configured from the insulator 718U andthe plural core configuration sections 714U. Similarly, as illustratedin FIG. 40B, the core configuration sections 714V are integrated to theinsulator portions 732V of the insulator 718V to form a V-phasesub-assembly 742V configured from the insulator 718V and the plural coreconfiguration sections 714V. Moreover, as illustrated in FIG. 40C, thecore configuration sections 714W are integrated to the insulatorportions 732W of the insulator 718W to form a W-phase sub-assembly 742Wconfigured from the insulator 718W and the plural core configurationsections 714W. The sub-assemblies 742U, 742V, 742W are thus formed foreach of the U-phase, the V-phase and the W-phase (the sub-assemblyforming process).

Next, as illustrated in FIG. 40A, a flyer machine 100 (see FIG. 5) isemployed to wind the coil wire 716U on each of the teeth sections 724Uof the U-phase sub-assembly 742U from the radial direction outside,forming the U-phase stator configuration section 712U with the pluralwinding portions 726U formed at the sub-assembly 742U. Note that theflyer machine 100 is, as illustrated in FIG. 5, configured including aflyer 101 that winds the coil wires 716 in a circular motion so as tocircle the periphery of each of the teeth sections 724, a variableformer 102 that aligns the coil wires 716 wound onto the teeth sections724, and a drive circuit 103 that controls the flyer 101 and thevariable former 102.

Similarly, as illustrated in FIG. 40B, the flyer machine 100 mentionedabove is employed to wind the coil wire 716V on each of the teethsections 724V of the V-phase sub-assembly 742V from the radial directionoutside, forming the V-phase stator configuration section 712V with theplural winding portions 726V formed at the sub-assembly 742V. Moreover,as illustrated in FIG. 40C, the flyer machine 100 mentioned above isemployed to wind the coil wire 716W on each of the teeth sections 724Wof the W-phase sub-assembly 742W from the radial direction outside,forming the W-phase stator configuration section 712W with the pluralwinding portions 726W formed at the sub-assembly 742W.

When this is performed, as illustrated in FIG. 40A, the plural crossingwires 728U are laid out along an outer peripheral face of the connectionportion 734U. The plural crossing wires 728U are also retained from asecond axial direction side (arrow Z2 side) of the connection portion734U by the projection shaped retaining portions 736U. Moreover,configuration is made such that the crossing wire 728U1 that isconnected to the winding start end portion of one of the windingportions 726U and the crossing wire 728U2 that is connected to thewinding finish end portion of this winding portion 726U cross over onthe respective radial direction extension portion 737U of the connectionportion 734U and the insulator portion 732U. When this occurs, thecrossing wire 728U1 and the crossing wire 728U2 are tightly crossed oversuch that slack does not occur in the winding portions 726U.

Similarly, as illustrated in FIG. 40B, the plural crossing wires 728Vare laid out along an outer peripheral face of the connection portion734V. The plural crossing wires 728V are also retained from the firstaxial direction side (the arrow Z1 side) of the connection portion 734Vby the projection shaped retaining portions 736V. Moreover,configuration is made such that the crossing wire 728V1 that isconnected to the winding start end portion of one of the windingportions 726V and the crossing wire 728V2 that is connected to thewinding finish end portion of this winding portion 726V cross over onthe respective radial direction extension portion 737V of the connectionportion 734V and the insulator portion 732V.

Moreover, as illustrated in FIG. 40C, the plural crossing wires 728W arelaid out along an outer peripheral face of the connection portion 734W.The plural crossing wires 728W are also retained from the first axialdirection side (the arrow Z1 side) of the connection portion 734W by theprojection shaped retaining portions 736W. Moreover, configuration ismade such that the crossing wire 728W1 that is connected to the windingstart end portion of one of the winding portions 726W and the crossingwire 728W2 that is connected to the winding finish end portion of thiswinding portion 726W cross over on the respective radial directionextension portion 737W of the connection portion 734W and the insulatorportion 732W.

A illustrated in FIG. 40A, the terminal portions 730U at the two endsides of the coil wire 716U are led out from the teeth sections 724U tothe first axial direction side (the arrow Z1 side) of the stator 710.Similarly, as illustrated in FIG. 40B, the terminal portions 730V at thetwo end sides of the coil wire 716V are led out from the teeth sections724V towards the first axial direction side of the stator 710. Moreover,as illustrated in FIG. 40C, the terminal portions 730W at the two endsides of the coil wire 716W are led out from the teeth sections 724Wtowards the first axial direction side of the stator 710. The statorconfiguration sections 712U, 712V, 712W are thus formed for each of theU-phase, the V-phase and the W-phase (the stator configuration sectionforming process).

Then, as illustrated in FIG. 41A and FIG. 41B, in a state in which theV-phase stator configuration section 712V is displaced by a specificangle in a circumferential direction with respect to the W-phase statorconfiguration section 712W, the V-phase stator configuration section712V is assembled to the W-phase stator configuration section 712W fromthe first axial direction side (the arrow Z1 side). Then, in a state inwhich the U-phase stator configuration section 712U is displaced by aspecific angle in a circumferential direction with respect to theV-phase stator configuration section 712V, the U-phase statorconfiguration section 712U is assembled to the V-phase statorconfiguration section 712V and the W-phase stator configuration section712W from the first axial direction side (the arrow Z1 side).

When this is performed, each of the plural yoke configuration sections722U, 722V, 722W is fitted between respective pairs of yokeconfiguration sections adjacent on both sides. The V-phase retainingportions 736V are fitted against n inner peripheral face of the U-phaseconnection portion 734U, and the W-phase retaining portions 736W arefitted against n inner peripheral face of the V-phase connection portion734V. The plural connection portions 734U, 734V, 734W are thus retainedin a state separated from each other in the radial direction by theprojection shaped retaining portions 736U, 736V, 736W.

The plural stator configuration sections 712U, 712V, 712W are thusassembled together in this manner to form the stator 710 (stator formingprocess). Note that the terminal portions 730U, 730V, 730W are connectedby a buzz bar or the like, not shown in the drawings. The stator 710 isaccordingly manufactured by the above processes.

Explanation follows regarding operation and advantageous effects of theseventh exemplary embodiment of the present invention.

Note that in the following explanation, for convenience the letters U,V, W are omitted as suffixes to the labels of each member and eachportion when no discrimination is made between the U-phase, the V-phaseand the W-phase.

According to the present exemplary embodiment, the yoke 740 isconfigured by the plural yoke configuration sections 722U segmented inthe circumferential direction. Therefore, even in a stator employed in aso-called inner rotor type brushless motor in which plural teethsections 724 project towards inside in a yoke 740 radial direction, thesub-assemblies 742 for each of the U-phase, V-phase and W-phase areformed as described above, and the coil wires 716 can be wound using theflyer machine 100 (see FIG. 5) onto each of the teeth sections 724 ofeach of the sub-assemblies 742 from outside in the radial direction ofthe yoke 740. There is accordingly no need to secure space between theteeth sections 724, as would be required when a nozzle machine isemployed, enabling a higher dense arrangement of the coil wires 716 tobe achieved, and enabling a more compact stator 710 to be realized.

Moreover, as described above, the yoke 740 is segmented in thecircumferential direction into the plural yoke configuration sections722, and so, for example, the stator 710 can be made more compact in theaxial direction in comparison to cases in which the yoke 740 issegmented into plural yoke configuration sections in the axialdirection.

When the flyer machine 100 is employed, since the winding speed of thecoil wires 716 is higher than when using a nozzle machine, the processof winding the coil wires 716 can be speeded up, and accordingly areduction in cost of the stator 710 can be achieved due to reducing thenumber of equipment units.

Moreover, in each of the plural groups (the U-phase, V-phase, W-phase)of the stator configuration sections 712, adjacent of the plural coreconfiguration sections 714 are disposed with a gap corresponding to twocore configuration sections present between each other. Hence, asdescribed above, the flyer machine 100 can be suppressed frominterfering with the other core configuration sections 714 even whenusing the flyer machine 100 to wind the coil wires 716 onto each of theteeth sections 724 of each of the sub-assemblies from the radialdirection outside.

Moreover, the coil wire 716U is formed continuously from one end to theother, and including the crossing wires 728U that are laid out along theconnection portion 734U and that connect together the plural windingportions 726U. Slack of the winding portions 726U from the teethsections 724U can accordingly be suppressed from occurring.

Moreover, the crossing wire 728U1 that is connected to the winding startend portion of one of the winding portions 726U and the crossing wire728U2 that is connected to the winding finish end portion of thiswinding portions 726U cross over in the connection vicinity between theconnection portion 734U and the respective insulator portion 732U. Slackof the winding portions 726U from the teeth sections 724U canaccordingly be more effectively suppressed from occurring.

In particular, the radial direction extension portions 737U that extendin the radial direction of the stator configuration section 712U areformed to the extending portions 739U that connect together insulatormain body portions 733U and the connection portion 734. The intersectionportions 729U of the crossing wires 728U1, 728U2 described above aredisposed at positions overlapping with the radial direction extensionportions 737U as viewed along the stator configuration section 712Uaxial direction. The crossing wires 728U1, 728U2 described aboveaccordingly cross over in space secured by the radial directionextension portions 737U, and so slackening of the winding portions 726Ufrom the teeth sections 724U can accordingly be even more effectivelysuppressed from occurring.

Moreover, due to the V-phase crossing wires 728V1, 728V2, and theW-phase crossing wires 728W1, 728W2 also crossing over similarly to theU-phase crossing wires 728U1, 728U2, slacking of the winding portions726V, 726W from the teeth sections 724V, 724W can be respectivelysuppressed from occurring.

Even though the teeth sections 724 project from the yoke configurationsections 722 towards the yoke 740 radial direction inside, the yoke 740is configured by the plural yoke configuration sections 722 segmented inthe yoke 740 circumferential direction, and so the coil wires 716 can bewound on each of the teeth sections 724 of each of the sub-assembliesusing the flyer machine 100 from the radial direction outside.

Moreover, in each of the stator configuration sections 712, theconnection portions 734 are respectively positioned further to theradial direction inside than the core configuration sections 714.Interference between the flyer of the flyer machine 100 and theconnection portions 734 can accordingly be suppressed from occurringwhen the coil wires 716 are respectively wound on the teeth sections 724from the radial direction outside using the flyer machine 100.

Moreover, the plural yoke configuration sections 722 are integrallyformed to the teeth sections 724. Magnetic loss at each of theconnection portions can accordingly be suppressed compared with, forexample, a two-part type core including independent members of pluralteeth sections with leading end portions connected together with thinnedbridging sections and a yoke that connects together base end portions ofthe teeth sections. Namely, magnetic loss occurs at three locations inthe two-part type core, at the bridging sections between the leading endportions of pairs of adjacent teeth sections, at the base end portionsof pairs of teeth sections, and at connection portion of the yoke. Incontrast thereto, in the stator 710 of the present exemplary embodiment,magnetic loss only occurs at one location, the connection portionbetween pairs of the adjacent yoke configuration sections 722, enablingmagnetic loss to be reduced. It is accordingly possible to achieve evengreater compactness and reduction in weight.

Although in the present exemplary embodiment, in each of the statorconfiguration sections 712, all of the crossing wires 728 cross over atthe connection vicinity between the connection portions 734 and theinsulator portions 732, configuration may be made such that one or moreof the crossing wires 728 do not cross over, as illustrated in FIG. 43.Namely, where there are cases in which the crossing wires 728 aretightly wound so as to cross over as illustrated in FIG. 40C,configuration may be made with any of the crossing wires 728 woundloosely without cross over.

In the present exemplary embodiment, the radial direction extensionportions 737 that extend in the radial direction of the statorconfiguration sections 712 are formed to the extending portions 739, andthe intersection portions 729 of the crossing wires 728 described aboveare disposed at positions overlapping with the radial directionextension portions 737 as viewed along the stator configuration sections712 axial direction. However, configuration may be made such that axialdirection extension portions are formed to the extending portions 739 toextend in an axial direction of the stator configuration sections 712,and the intersection portions 729 of the above crossing wires 728 aredisposed at positions overlapping with the axial direction extensionportions as viewed along a stator configuration sections 712 radialdirection. Slacking of the winding portions 726 from the teeth sections724 can also be suppressed from occurring by adopting such aconfiguration.

Moreover, although the crossing wires 728 are laid out along theconnection portions 734, configuration may also be made with a straightline stretched formation in which tension is applied to crossing wiresnot laid out along the connection portions 734.

Eighth Exemplary Embodiment

Explanation follows regarding an eighth exemplary embodiment of thepresent invention. A stator 810 according to the eighth exemplaryembodiment of the present invention illustrated in FIG. 44 has portionssimilar to those of the stator of the first exemplary embodiment.Explanation hence focuses on differing portions and explanation ofsimilar portions is omitted as appropriate.

As illustrated in FIG. 45A, in a U-phase stator configuration section812, an insulator 818U includes plural resin-formed insulator portions832U. The number of plural insulator portions 832U provided is the sameas the number of plural teeth sections 824U. The plural insulatorportions 832U include respective insulator main body portions 833U andextension side wall portions 835U. The insulator main body portions 833Uare integrated to respective surfaces of plural core configurationsections 814U, for example by integral molding or interlock mounting.The insulator main body portions 833U insulate between the teethsections 824U formed to the core configuration sections 814U and windingportions 826U. The extension side wall portions 835U are positionedfurther inside in a radial direction of stator configuration section812U than the core configuration sections 814U (than the insulator mainbody portions 833U). The extension side wall portions 835U extend from aconnection portion 834U towards a second axial direction side (arrow Z2side) of the stator configuration section 812U, and connect together theinsulator main body portions 833U and the connection portion 834U.

A V-phase stator configuration section 812V illustrated in FIG. 45B alsohas a similar basic configuration to the U-phase stator configurationsection 812U described above.

The plural insulator portions 832V include respective insulator mainbody portions 833V, extension side wall portions 835V and radialdirection extension portions 837V. The insulator main body portions 833Vare integrated to respective surfaces of plural core configurationsections 814V, for example by integral molding or interlock mounting.The insulator main body portions 833V insulate between teeth sections824V formed to the core configuration sections 814V and winding portions826V. The extension side wall portions 835V are positioned furtherinside in a radial direction of the stator configuration section 812Vthan the core configuration sections 814V (than the insulator main bodyportions 833V). The radial direction extension portions 837V extendoutside in the radial direction of the stator configuration section 812Vfrom connection portion 834V. The extension side wall portions 835Vextend from extending ends of the radial direction extension portions837V towards a second axial direction side (Z2 side) of the statorconfiguration section 812V and connect together the insulator main bodyportions 833V and the radial direction extension portions 837V. Theconnection portion 834V is provided at a first axial direction side (Z1side) of the plural insulator portions 832V. The connection portion 834Vis formed in a ring shape, connects together the plural insulatorportions 832V, and is positioned further to the radial direction insidethan the core configuration sections 814V.

A W-phase stator configuration section 812W illustrated in FIG. 45C alsohas a similar basic configuration to the U-phase stator configurationsection 812U described above.

The plural insulator portions 832W include respective insulator mainbody portions 833W, extension side wall portions 835W and radialdirection extension portions 837W. The insulator main body portions 833Ware integrated to respective surfaces of plural core configurationsections 814W, for example by integral molding or interlock mounting.The insulator main body portions 833W insulate between teeth sections824W formed to the core configuration sections 814W and winding portions826W. The extension side wall portions 835W are positioned furtherinside in a radial direction of the stator configuration section 812Wthan the core configuration sections 814W (than the insulator main bodyportions 833W). The radial direction extension portions 837W extendoutside in the radial direction of the stator configuration section 812Wfrom connection portion 834W. The extension side wall portions 835Wextend from extending ends of the radial direction extension portions837W towards a second axial direction side (arrow Z2 side) of the statorconfiguration section 812W, and connect together the insulator main bodyportions 833W and the radial direction extension portions 837W. Theconnection portion 834W is provided at a first axial direction side (thearrow Z1 side) of the plural insulator portions 832W. The connectionportion 834W is formed in a ring shape, connects together the pluralinsulator portions 832W (or more specifically, extension end portions(end portions on the radial direction inside) of the extension side wallportions 835W of the plural insulator portions 832W), and is positionedfurther to the radial direction inside than the core configurationsections 814W.

Moreover, in a state in which the plural connection portions 834U, 834V,834W are disposed with gaps between each other in a radial direction ofthe yoke 840, V-phase crossing wires 828V pass through inside notches838U formed in the U-phase connection portion 834U (are housed in thenotches 838U), and W-phase crossing wires 828W pass through insidenotches 838V formed in the V-phase connection portion 834V and throughinside notches 838U formed in the U-phase connection portion 834U (arehoused in the notches 838U and notches 838V) (see FIG. 46B). The notches838U, 838V are examples of housing portion of the present invention.

In each of the stator configuration sections 812U, 812V, 812W of theplural groups described above, as illustrated in FIG. 48, the positionalrelationship between one of the core configuration section 814 andanother of the core configuration sections 814 adjacent to this coreconfiguration section 814 is as set out below, when an imaginary tangentline X passes through the extension side wall portion 835 in atangential direction to the stator configuration section 812, acircumferential direction end portion 822A of a yoke configurationsection 822 in one of the core configuration sections 814 is positionedon the opposite side with respect to the imaginary tangent line X formthe other core configuration section 814. Note that the imaginarytangent line X may pass through the extension side wall portions 835 atany position on the extension side wall portion 835, in plan view.

In each of the stator configuration sections 812U, 812V, 812W of theplural groups, the winding portions are pressed and compression deformed(high density packed) by a press 104, as described later (see FIG. 49and FIG. 50).

Explanation follows regarding a manufacturing method of the stator 810configured as described above. A sub-assembly forming process and astator configuration section forming process are substantially the sameas those of the first exemplary embodiment.

In each of the stator configuration sections 812U, 812V, 812W of theplural groups, as illustrated in FIG. 49 and FIG. 50, the windingportions 826 are pressed and compression deformed by the press 104(compression process). When this is performed, the winding portions 826are pressed from both side in a direction intersecting with (for exampleorthogonal to) the teeth sections 824 axial direction. Moreover, thewinding portions 826 are pressed such that pressing direction to thewinding portions 826 is arranged in a tangential direction to the statorconfiguration section 812.

Explanation follows regarding operation and advantageous effects of theeighth exemplary embodiment of the present invention.

In each of the stator configuration section 812 of the plural groups, asillustrated in FIG. 48, when the imaginary tangent line X passes throughthe extension side wall portion 835 in a tangential direction to thestator configuration section 812, the circumferential direction endportions 822A of the yoke configuration section 822 of one of the coreconfiguration sections 814 are positioned on the opposite side withrespect to the imaginary tangent line X to the other core configurationsections 814 that are adjacent to this core configuration section 814.Consequently, even when coil wires 816 are wound onto each of the teethsections 824 of each of the sub-assemblies from the radial directionoutside using the flyer machine 100, the flyer machine 100 can besuppressed from interfering with the other core configuration sections814, and in particular interfering with the circumferential directionend portions 822A of the yoke configuration section 822.

Namely, suppose that, as illustrated in FIG. 56, a circumferentialdirection end portion 1122A of a yoke configuration section 1122 in oneof the core configuration sections 1114 is positioned on the same sidewith respect to the imaginary tangent line X to another of the coreconfiguration sections 1114, the flyer machine 100 would interfere withthe circumferential direction end portion 1122A of the yokeconfiguration section 1122 of the another core configuration sections1114. However, according to the present exemplary embodiment suchinterference can be suppressed from occurring.

Moreover, the winding portions 826 are pressed and compression deformed(high density packed) by the press 104. Bulges in the winding portions826 are accordingly suppressed, a high dense arrangement of the coilwires 816 can be achieved, and space for the pressing operation of thepress 104 can also be secured.

Moreover, in the compression process, the winding portions 826 arepressed in a direction intersecting with the teeth sections 824 axialdirection. Therefore, as illustrated in FIG. 49, even in cases in whichgaps occur between the teeth sections 824 and the winding portions 826or in cases in which gaps are left between individual strands of coilwire in the winding portions 826, bulging of the winding portions 826can be better suppressed, and a high dense arrangement of the coil wires816 can be achieved. In particular, the coil wires 816 can be bettercompression deformed due to pressing the winding portions 826 from bothsides in a direction intersecting with the teeth sections 824 axialdirection.

Moreover, in the compression process the winding portions 826 arepressed such that the pressing direction on the winding portions 826 isa tangential direction to the stator configuration section 812. In eachof the plural groups of the stator configuration sections 812, adjacentcore configuration sections 814 are disposed while a space of two coreconfiguration sections is maintained between the adjacent coreconfiguration sections 814. The winding portions 826 can accordingly bepressed while still suppressing the press 104 from interfering with thecore configuration sections 814.

Ninth Exemplary Embodiment

Explanation follows regarding a ninth exemplary embodiment of thepresent invention.

In the eighth exemplary embodiment of the present invention, the stator810 is employed in an inner rotor type motor, and the teeth sections 824protrude from the yoke configuration section 822 towards the yoke 840radial direction inside. However, as illustrated in FIG. 51 and FIG. 52,a stator 910 according to the ninth exemplary embodiment of the presentinvention is employed in an outer rotor type motor. The teeth sections924 project out from a yoke configuration section 922 towards an outsidein a radial direction of a yoke 940. Yoke configuration sections 923 areformed to leading end portions of the teeth sections 924. Note that thestator 910 is employed in a 10-pole, 12-slot or a 14-pole, 12-slotmotor. Other than in the above respects, configuration of the presentexemplary embodiment is substantially similar to that of the eighthexemplary embodiment of the present invention.

When such a configuration is adopted, an interval can be secured betweenleading end portions of adjacent teeth sections 924, and therefore acoil wire winding machine can be employed to wind the coil wires 916onto each of the teeth sections 924 from the radial direction outside.Namely, even when circumferential direction end portions of the yokeconfiguration sections 923 of one of the teeth sections 924 arepositioned on the same side with respect to the above imaginary tangentline X (see FIG. 48) as other teeth sections 924, interference of aflyer machine with the teeth sections 924 (the yoke configurationsections 923) can be suppressed in comparison to the conventional casesby employing for example a non-illustrated variable former.

Note that in the present exemplary embodiment, as illustrated in FIG.52, the adjacent yoke configuration sections 922 may fit together withrecess and protrusion shaped fitting portions 944. Adopting such aconfiguration enables the rigidity of the yoke 940 to be raised.

Tenth Exemplary Embodiment

Explanation follows regarding a tenth exemplary embodiment of thepresent invention.

A stator 10140 according to the tenth exemplary embodiment of thepresent invention illustrated in FIG. 53 has a configuration changed inthe following manner from the stator 910 according to the ninthexemplary embodiment of the present invention described above. Namely,the stator 10140, as illustrated in FIG. 54A to FIG. 54C, is segmentedinto stator configuration sections 1012A, 1012B, 1012C configured foreach of groups that include plural phases. Note that the stator 10140is, for example, applied to a 10-pole, 12-stroke brushless motor 1060.

As illustrated in FIG. 54A, the stator configuration section 1012Aconfiguring a first group includes a +U-phase teeth section 1024U, a−U-phase teeth section 1024U, a +W-phase teeth section 1024W and a−W-phase teeth section 1024W. Moreover, as illustrated in FIG. 54B, thestator configuration section 1012B configuring a second group includes a+V-phase teeth section 1024V, a −V-phase teeth section 1024V, a +W-phaseteeth section 1024W and a −W-phase teeth section 1024W. Moreover, asillustrated in FIG. 54C, the stator configuration section 1012Cconfiguring a third group includes a +U-phase teeth section 1024U, a−U-phase teeth section 1024U, a +V-phase teeth section 1024V and−V-phase teeth section 1024V. Each of the stator configuration sections1012A, 1012B, 1012C are thus configured by a combination of mutuallydifferent phases (U-phase, V-phase, W-phase).

Moreover, in each of the stator configuration sections 1012A, 1012B,1012C, the plural teeth sections 1024 are disposed at even intervalsfrom each other (at for example 90 degrees in the present exemplaryembodiment). As illustrated in FIG. 53, in each of the statorconfiguration sections 1012A, 1012B, 1012C, two core configurationsections 1014 (teeth sections 1024) from other stator configurationsections are disposed between each adjacent pair of core configurationsections 1014 (teeth sections 1024).

As illustrated in FIG. 54A, the coil wire 1016U is wound in a tighteningdirection (forwards) on the −U-phase teeth section 1024 and in aloosening direction (reverse direction) on the +U-phase teeth section1024. Namely, the winding portions 1026U and the crossing wires 1028U inthe coil wire 1016U are connected together by a lead portion 1046 thatis led out from the teeth section 1024U. The coil wire 1016U is wound inthe tightening direction when, as viewed along an axial direction of thestator configuration section 1012A, the lead portion 1046 extends so asto intersect the stator configuration section 1012A radial direction(when overlapping with the core configuration section 1014U). However,the coil wire 1016U is wound in the loosening direction when, as viewedalong the axial direction of the stator configuration section 1012A, thelead portion 1046 extends along the stator configuration section 1012Aradial direction (when not overlapping with the core configurationsection 1014U).

Similarly, as illustrated in FIG. 54A, the coil wire 1016W is wound inthe tightening direction on the +W-phase teeth section 1024 and the coilwire 1016W is wound in the loosening direction on the −W-phase teethsection 1024. Moreover, as illustrated in FIG. 54B, the coil wire 1016Vis wound in the tightening direction on the −V-phase teeth section 1024and the coil wire 1016V is wound in the loosening direction on the+V-phase teeth section 1024. The coil wire 1016W is wound in thetightening direction on the +W-phase teeth section 1024 and coil wire1016W is wound in the loosening direction on the −W-phase teeth section1024. Moreover, as illustrated in FIG. 54C, the coil wire 1016U is woundin the tightening direction on the +U-phase teeth section 1024U and coilwire 1016U is wound in the loosening direction on the −U-phase teethsection 1024U. The coil wire 1016V is wound in the tightening directionon the +V-phase teeth section 1024V and the coil wire 1016V is wound inthe loosening direction on the −V-phase teeth section 1024V.

Thus, out of the plural winding portions 1026, pairs of winding portions1026 facing each other across central axes of the plural statorconfiguration sections 1012A, 1012B, 1012C are formed with the same coilwire 1016 and are formed with opposite winding directions to each other.Note that in order to prevent flow of circulating currents that occurwhen a parallel circuit is configured using plural coil wires 1016,preferably two circuit systems are configured without parallel circuits,or plural parallel circuits are combined such that circulating currentsare not generated (so-called cancelling winding) even though parallelcircuits are formed.

Out of pairs of winding portions 1026 facing each other across thecentral axes of the plural stator configuration sections 1012A, 1012B,1012C, the winding portion 1026 wound in the loosening direction on theteeth section 1024 and the crossing wire 1028 between the pair ofwinding portions 1026 are connected together by the lead portion 1046that leads out from the teeth sections 1024.

Moreover, as illustrated in FIG. 55, a protrusion portion 1048 is formedto an insulator 1018, and the lead portion 1046 is anchored to theprotrusion portion 1048. The insulator 1018 is formed with insulatormain body portions 1033 and extension side wall portions 1035. Theinsulator main body portions 1033 insulate between the teeth sections1024 integrated to the core configuration sections 1014 and the windingportions 1026. The extension side wall portions 1035 extend in an axialdirection of the stator configuration section 1012 from a connectionportion 1034 and connect together the insulator main body portions 1033and the connection portion 1034. The protrusion portion 1048 is, morespecifically, formed at an end portion in an extension direction of theextension side wall portions 1035 (the same direction as the statorconfiguration section 1012 axial direction). Out of the pairs of windingportions 1026 described above, at the winding portion 1026 wound in theloosening direction on the teeth section 1024, the lead portion 1046 isrestricted from slackening by anchoring on the protrusion portion 1048.

Note that other parts of the configuration in the present exemplaryembodiment, are similar to those of the eighth and ninth exemplaryembodiments of the present invention.

Due to adopting such a configuration, the plural teeth sections 1024 aredisposed at even intervals in each of the stator configuration sections1012, and separation between the teeth sections 1024 is secured. Thecoil wires 1016 can accordingly be easily wound on the teeth sections1024.

Moreover, the winding portions 1026 that are wound in the looseningdirection on the teeth sections 1024 are restricted from slackening byanchoring the lead portions 1046 on the projection portions 1048.Slackening of the winding portions 1026 that are wound in the looseningdirection onto the teeth sections 1024 can accordingly be suppressed.

Note that in the present exemplary embodiment, the stator 10140 is, asillustrated in FIG. 53, employed in an outer rotor type motor, and theteeth sections 1024 project out from a yoke configuration sections 1022towards a yoke 1040 radial direction outside. However, the stator 10140may be employed in an inner rotor type motor, with the teeth sections1024 configured to project out from the yoke configuration sections 1022towards the yoke 1040 radial direction inside.

Moreover, in other modified examples thereof, it is also possible toemploy modified examples similar to the those of the eighth exemplaryembodiment of the present invention described above. Moreover, althoughthe stator 10140 is as an example applied to a 10-pole, 12-slotbrushless motor, application may be made to a 14-pole, 12-slot brushlessmotor.

Generally copper is employed as wire material for the coil wires,however aluminum coil wire is recently attracting attention in order toreduce cost. However, aluminum coil wire has inferior durability totensional stress compared to copper coil wire, and there are concernsthat coil wire may break or may have damage to insulation layers of thecoil wire by using conventional complicated winding methods that areemployed in high speed winding machines. However, in each of the aboveexemplary embodiments, even for such a relatively soft material asaluminum coil wire, the load on the coil wire is light, and it ispossible to wind coil wire at high speed.

Explanation is given above of each exemplary embodiments of the presentinvention, however the present invention is not limited by the above,and clearly various modifications are possible in addition to thosedescribed above within a scope not departing from the spirit of thepresent invention.

What is claimed is:
 1. A stator comprising: a plurality of coreconfiguration sections each comprising a plurality of yoke configurationsections that configure a ring shaped yoke and are segmented in a yokecircumferential direction and a plurality of teeth sections that projectfrom the respective yoke configuration sections along a radial directionof the yoke, with the plurality of yoke configuration sections and theplurality of teeth sections integrated together; a plurality of coilwires that are wound onto the respective teeth sections to configure aplurality of winding portions; and a plurality of insulators, eachincluding a plurality of insulator portions and a connection portionthat connects together the plurality of insulator portions, theplurality of insulator portions being integrated with respective coreconfiguration sections and insulating the teeth sections from thewinding portions, wherein: a plurality of independently formed groups ofstator configuration sections are configured by assembling the pluralityof core configuration sections with the respective plurality ofinsulators; in each of the plurality of stator configuration sectiongroups, the plurality of core configuration sections are disposed so asto form a gap corresponding to at least one core configuration sectionbetween adjacent core configuration sections; the plurality of statorconfiguration section groups are disposed such that, in a mutuallyassembled state, a core configuration section of another group isdisposed in each gap; each of the plurality of coil wires is formedcontinuously from end-to-end and includes a crossing wire that connectstogether the plurality of winding portions; and out of the crossingwires, at least one of the crossing wires connected to a winding startend portion of the winding portion and one of the crossing wiresconnected to a winding finish end portion of the winding portion crossover at a connection vicinity between the connection portion and theinsulator portion.
 2. The stator of claim 1, wherein: each of theinsulator portions includes an insulator main body portion, that isintegrated with the core configuration section and insulates the teethsection from the winding portion, and an extending portion that connectstogether the insulator main body portion and the connection portion; anda radial direction extension portion is formed at the extending portionso as to extend, in a radial direction of the stator configurationsection, from the connection portion; and an intersection portionbetween the crossing wire connected to the winding start end portion ofthe winding portion and the crossing wire connected to the windingfinish end portion of the winding portion is disposed at a position thatoverlaps with the radial direction extension portion as viewed along thestator configuration section axial direction.
 3. The stator of claim 1,wherein: each of the insulator portions includes an insulator main bodyportion, that is integrated with the core configuration section andinsulates the teeth section from the winding portion, and an extendingportion that connects together the insulator main body portion and theconnection portion; and an axial direction extension portion is formedat the extending portion so as to extend, in an axial direction of thestator configuration section, from the connection portion; and anintersection portion between the crossing wire connected to the windingstart end portion of the winding portion and the crossing wire connectedto the winding finish end portion of the winding portion is disposed ata position that overlaps with the axial direction extension portion asviewed along the stator configuration section radial direction.
 4. Thestator of claim 1, wherein the teeth section projects from the yokeconfiguration section towards the yoke radial direction inner side.